Index: openacs-4/packages/calendar/calendar.info
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/calendar.info,v
diff -u -r1.41.2.3 -r1.41.2.4
--- openacs-4/packages/calendar/calendar.info	25 Sep 2013 10:22:56 -0000	1.41.2.3
+++ openacs-4/packages/calendar/calendar.info	3 Oct 2013 07:39:45 -0000	1.41.2.4
@@ -7,7 +7,7 @@
     <initial-install-p>f</initial-install-p>
     <singleton-p>f</singleton-p>
     
-    <version name="2.6.0" url="http://openacs.org/repository/download/apm/calendar-2.6.0.apm">
+    <version name="2.6.1d2" url="http://openacs.org/repository/download/apm/calendar-2.6.1d2.apm">
         <owner url="mailto:openacs-calendar@dirkgomez.de">Dirk Gomez</owner>
         <summary>Personal and shared event calendars.</summary>
         <release-date>2013-09-08</release-date>
@@ -17,7 +17,7 @@
         <maturity>2</maturity>
         <package_instance_name>#calendar.Calendar#</package_instance_name>
 
-        <provides url="calendar" version="2.6.0"/>
+        <provides url="calendar" version="2.6.1d2"/>
         <requires url="attachments" version="0.10"/>
         <requires url="acs-datetime" version="5.2.2"/>
         <requires url="acs-events" version="0.6d2"/>
Index: openacs-4/packages/calendar/tcl/cal-item-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/tcl/cal-item-procs.tcl,v
diff -u -r1.25 -r1.25.4.1
--- openacs-4/packages/calendar/tcl/cal-item-procs.tcl	26 Feb 2009 02:12:15 -0000	1.25
+++ openacs-4/packages/calendar/tcl/cal-item-procs.tcl	3 Oct 2013 07:39:45 -0000	1.25.4.1
@@ -23,7 +23,7 @@
 } {
     set dates_valid_p [db_string dates_valid_p_select {}]
 
-    if {[string equal $dates_valid_p 1]} {
+    if {$dates_valid_p eq "1"} {
         return 1
     } else {
         return 0
@@ -127,7 +127,7 @@
     set row(start_date) [lc_time_fmt $row(start_date_ansi) "%Y-%m-%d"]
     set row(end_date) [lc_time_fmt $row(end_date_ansi) "%Y-%m-%d"]
 
-    set row(day_of_week) [expr [lc_time_fmt $row(start_date_ansi) "%w"] + 1]
+    set row(day_of_week) [expr {[lc_time_fmt $row(start_date_ansi) "%w"] + 1}]
     set row(pretty_day_of_week) [lc_time_fmt $row(start_date_ansi) "%A"]
     set row(day_of_month) [lc_time_fmt $row(start_date_ansi) "%d"]
     set row(pretty_short_start_date) [lc_time_fmt $row(start_date_ansi) "%x"]
@@ -178,7 +178,7 @@
             set recurrence_id [db_string select_recurrence_id {}]
 
             # If the recurrence id is NULL, then we stop here and just do the normal update
-            if {![empty_string_p $recurrence_id]} {
+            if {$recurrence_id ne ""} {
                 calendar::item::edit_recurrence \
                     -event_id $cal_item_id \
                     -start_date $start_date \
@@ -216,7 +216,7 @@
             # Update the item_type_id and calendar_id
             set colspecs [list]
             lappend colspecs "item_type_id = :item_type_id"
-            if { ![empty_string_p $calendar_id] } {
+            if { $calendar_id ne "" } {
                 lappend colspecs "on_which_calendar = :calendar_id"
 
                 db_dml update_context_id {
@@ -256,12 +256,12 @@
     update the permission of the specific cal_item
     if revoke is set to revoke, then we revoke all permissions
 } {
-    if { ![string equal $revoke "revoke"] } {
-	if { ![string equal $permission "cal_item_read"] } {
+    if { $revoke ne "revoke" } {
+	if { $permission ne "cal_item_read" } {
             permission::grant -object_id $cal_item_id -party_id $party_id -privilege cal_item_read
 	}
         permission::grant -object_id $cal_item_id -party_id $party_id -privilege $permission
-    } elseif { [string equal $revoke "revoke"] } {
+    } elseif {$revoke eq "revoke"} {
         permission::revoke -object_id $cal_item_id -party_id $party_id -privilege $permission
 
     }
@@ -309,7 +309,7 @@
         }
 	set colspecs [list]
         lappend colspecs {item_type_id = :item_type_id}
-        if { ![empty_string_p $calendar_id] } {
+        if { $calendar_id ne "" } {
             lappend colspecs {on_which_calendar = :calendar_id}
 
             db_dml update_context_id {
Index: openacs-4/packages/calendar/tcl/calendar-callback-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/tcl/calendar-callback-procs.tcl,v
diff -u -r1.6 -r1.6.8.1
--- openacs-4/packages/calendar/tcl/calendar-callback-procs.tcl	8 Aug 2006 21:26:17 -0000	1.6
+++ openacs-4/packages/calendar/tcl/calendar-callback-procs.tcl	3 Oct 2013 07:39:45 -0000	1.6.8.1
@@ -15,7 +15,7 @@
     set return_msg [list $msg]
     
     set cals [db_list get_calendars {*SQL*} ]
-    if { [empty_string_p $cals ] } {
+    if { $cals eq "" } {
 	lappend return_msg "none"
     } else {
 	lappend return_msg $cals
Index: openacs-4/packages/calendar/tcl/calendar-outlook-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/tcl/calendar-outlook-procs.tcl,v
diff -u -r1.15 -r1.15.12.1
--- openacs-4/packages/calendar/tcl/calendar-outlook-procs.tcl	12 Jul 2004 14:49:55 -0000	1.15
+++ openacs-4/packages/calendar/tcl/calendar-outlook-procs.tcl	3 Oct 2013 07:39:45 -0000	1.15.12.1
@@ -41,7 +41,7 @@
         # we need to have the hour equal gmt at the same time as the client
         # i.e. if its noon gmt, then its 4am in pst
         # 
-        if ![empty_string_p $dash] {
+        if {$dash ne ""} {
             set date_time_math "- $hours/24"
         } else {
             set date_time_math "+ $hours/24"
@@ -76,7 +76,7 @@
         set ics_event "BEGIN:VCALENDAR\r\nPRODID:-//OpenACS//OpenACS 5.0 MIMEDIR//EN\r\nVERSION:2.0\r\nMETHOD:PUBLISH\r\nBEGIN:VEVENT\r\nDTSTART:$DTSTART\r\nDTEND:$DTEND\r\n"
 
         # Recurrence stuff
-        if {![empty_string_p $cal_item(recurrence_id)] && $all_occurences_p} {
+        if {$cal_item(recurrence_id) ne "" && $all_occurences_p} {
 
             set recur_rule "RRULE:FREQ="
 
@@ -91,7 +91,7 @@
                 year { append recur_rule "YEARLY"}
             }
 
-            if { $recurrence(interval_name) == "week" && ![empty_string_p $recurrence(days_of_week)] } {
+            if { $recurrence(interval_name) eq "week" && $recurrence(days_of_week) ne "" } {
                 
                 #DRB: Standard indicates ordinal week days are OK, but Outlook
                 #only takes two-letter abbreviation form.
@@ -106,11 +106,11 @@
                 }
             }
 
-            if { ![empty_string_p $recurrence(every_nth_interval)] } {
+            if { $recurrence(every_nth_interval) ne "" } {
                 append recur_rule ";INTERVAL=$recurrence(every_nth_interval)"
             }
 
-            if { ![empty_string_p $recurrence(recur_until)] } {
+            if { $recurrence(recur_until) ne "" } {
                 #DRB: this should work with a DATE: type but doesn't with Outlook at least.
                 append recur_rule ";UNTIL=$recurrence(recur_until)"
                 append recur_rule "T000000Z"
Index: openacs-4/packages/calendar/tcl/calendar-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/tcl/calendar-procs.tcl,v
diff -u -r1.32 -r1.32.4.1
--- openacs-4/packages/calendar/tcl/calendar-procs.tcl	30 Aug 2008 19:51:23 -0000	1.32
+++ openacs-4/packages/calendar/tcl/calendar-procs.tcl	3 Oct 2013 07:39:45 -0000	1.32.4.1
@@ -25,7 +25,7 @@
     
     # MUST CONVERT TO ARRAYS! (ben)
     array set event_date_arr $event_date
-    if {![empty_string_p $event_time]} {
+    if {$event_time ne ""} {
         array set event_time_arr $event_time
     }
     
@@ -34,7 +34,7 @@
     set day    $event_date_arr(day)
     set month  $event_date_arr(month)
     
-    if {![empty_string_p $event_time]} {
+    if {$event_time ne ""} {
         # extract from event_time
         set hours $event_time_arr(hours)
         set minutes $event_time_arr(minutes)
@@ -67,7 +67,7 @@
 	set day "0$day"
     }
     
-    if {[empty_string_p $event_time]} {
+    if {$event_time eq ""} {
         return "$year-$month-$day"
     } else {
         return "$year-$month-$day $hours:$minutes"
@@ -133,18 +133,18 @@
     # if the permission is public, oassign the magic object
     # and set permission to read
 
-    if { [string equal $cal_privilege "public"] } {
+    if {$cal_privilege eq "public"} {
 	
         set party_id [acs_magic_object "the_public"]
 	set cal_privilege "calendar_read"
-    } elseif { [string equal $cal_privilege "private"] } {
+    } elseif {$cal_privilege eq "private"} {
 	set cal_privilege "calendar_read"
     } 
 
-    if { [empty_string_p $revoke] } {
+    if { $revoke eq "" } {
 	# grant the permissions
         permission::grant -object_id $calendar_id -party_id $party_id -privilege $cal_privilege
-    } elseif { [string equal $revoke "revoke"] } {
+    } elseif {$revoke eq "revoke"} {
 	# revoke the permissions
         permission::revoke -object_id $calendar_id -party_id $party_id -privilege $cal_privilege
     }    
@@ -172,9 +172,9 @@
         set result [db_string get_calendar_info {} -default 0]
     }
     
-    if { ![string equal $result "0"] } {
+    if { $result ne "0" } {
 
-	if { [string equal $return_id "1"] } {
+	if {$return_id eq "1"} {
 	    return $result
 	} else {
 	    return 1
@@ -203,15 +203,15 @@
     @creation-date 20-July-2003
 } {
     set first_day_of_week [lc_get firstdayofweek]
-    set last_day_of_week [expr [expr $first_day_of_week + 6] % 7]
+    set last_day_of_week [expr {[expr {$first_day_of_week + 6}] % 7}]
 
     if {$current_day == $today_julian_date} {
         set today_p t 
     } else {
         set today_p f
     }
-    set day_number [expr $current_day - $first_julian_date_of_month +1]
-    set weekday [expr [expr $current_day % 7] + 1]
+    set day_number [expr {$current_day - $first_julian_date_of_month +1}]
+    set weekday [expr {[expr {$current_day % 7}] + 1}]
     set weekday [ad_decode $weekday 7 0 $weekday]
 
     set beginning_of_week_p f
@@ -312,16 +312,16 @@
     {-privilege ""}
 } {
     # If no user_id
-    if {[empty_string_p $user_id]} {
+    if {$user_id eq ""} {
         set user_id [ad_conn user_id]
     }
 
-    if {[empty_string_p $package_id]} {
+    if {$package_id eq ""} {
         set package_id [ad_conn package_id]
     }
     
     set permissions_clause {}
-    if { ![empty_string_p $privilege] } {
+    if { $privilege ne "" } {
         set permissions_clause [db_map permissions_clause]
     }
 
@@ -332,8 +332,8 @@
     {-date ""}
     {-julian_date ""}
 } {
-    if {[empty_string_p $date]} {
-        if {![empty_string_p $julian_date]} {
+    if {$date eq ""} {
+        if {$julian_date ne ""} {
             set date [dt_julian_to_ansi $julian_date]
         } else {
             set date [dt_sysdate]
@@ -349,7 +349,7 @@
     {-calendar_name:required}
     {-package_id ""}
 } {
-    if { [empty_string_p $package_id] } {
+    if { $package_id eq "" } {
         set package_id [ad_conn package_id]
     }
     set extra_vars [ns_set create]
@@ -369,7 +369,7 @@
     
     @param user_id The user whose calendar you want to check
 } {
-    if { [empty_string_p $user_id] } {
+    if { $user_id eq "" } {
         set user_id [ad_conn user_id]
     }
     calendar::get -calendar_id $calendar_id -array calendar
@@ -415,7 +415,7 @@
 } {
     creates a new item type
 } {
-    if {[empty_string_p $item_type_id]} {
+    if {$item_type_id eq ""} {
         set item_type_id [db_nextval cal_item_type_seq]
     }
 
@@ -495,7 +495,7 @@
     append new_content "[_ calendar.Start_Time]: $cal_item(start_date_ansi) $cal_item(start_time)<br>\n"
     append new_content "[_ calendar.to]: $cal_item(end_date_ansi) $cal_item(end_time)<br>\n"
 
-    if {![empty_string_p $repeat_p] && $repeat_p} {
+    if {$repeat_p ne "" && $repeat_p} {
         append new_content "[_ calendar.is_recurring]"
     }
 
Index: openacs-4/packages/calendar/tcl/calendar-sc-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/tcl/calendar-sc-procs.tcl,v
diff -u -r1.2 -r1.2.8.1
--- openacs-4/packages/calendar/tcl/calendar-sc-procs.tcl	16 Aug 2006 17:52:14 -0000	1.2
+++ openacs-4/packages/calendar/tcl/calendar-sc-procs.tcl	3 Oct 2013 07:39:45 -0000	1.2.8.1
@@ -21,10 +21,10 @@
 
     # build a text content 
     foreach key {description pretty_day_of_week start_time end_time full_start_date start_date_ansi} {
-        if {[string eq $key start_time]} { 
+        if {$key eq "start_time"} { 
             append content "from "
         }
-        if {[string eq $key end_time]} { 
+        if {$key eq "end_time"} { 
             append content "to "
         }
         append content "$row($key) "
Index: openacs-4/packages/calendar/tcl/test/cal-item-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/tcl/test/cal-item-procs.tcl,v
diff -u -r1.2 -r1.2.6.1
--- openacs-4/packages/calendar/tcl/test/cal-item-procs.tcl	15 May 2007 20:14:21 -0000	1.2
+++ openacs-4/packages/calendar/tcl/test/cal-item-procs.tcl	3 Oct 2013 07:39:45 -0000	1.2.6.1
@@ -48,10 +48,10 @@
             set recurrence_event_ids [db_list q "select cal_item_id as cal_item_id from acs_events, cal_items where cal_item_id=event_id and recurrence_id=:recurrence_id" ]
             foreach event_id $recurrence_event_ids {
                  calendar::item::get -cal_item_id $event_id -array cal_item
-                set passed [expr {$passed && [string equal $ci_name $cal_item(name)]}]
+                set passed [expr {$passed && $ci_name eq $cal_item(name)}]
 # for some reason the description is not set                
 
-                set passed [expr {$passed && [string equal $ci_description $cal_item(description)]}]
+                set passed [expr {$passed && $ci_description eq $cal_item(description)}]
                 lappend recurrence_event_ids $event_id
             }
             aa_true "Name correct on all recurrences" $passed
@@ -72,9 +72,9 @@
 
             foreach event_id $recurrence_event_ids {
                  calendar::item::get -cal_item_id $event_id -array cal_item
-                set passed [expr {$passed && [string equal $ci_name $cal_item(name)]}]
+                set passed [expr {$passed && $ci_name eq $cal_item(name)}]
 # for some reason the description is not set                
-                set passed [expr {$passed && [string equal $ci_description $cal_item(description)]}]
+                set passed [expr {$passed && $ci_description eq $cal_item(description)}]
             }
             aa_true "Name correct on all recurrences 2" $passed
 
@@ -94,9 +94,9 @@
 
             foreach event_id $recurrence_event_ids {
                  calendar::item::get -cal_item_id $event_id -array cal_item
-                set passed [expr {$passed && [string equal $new_names($event_id) $cal_item(name)]}]
+                set passed [expr {$passed && $new_names($event_id) eq $cal_item(name)}]
 # for some reason the description is not set                
-                set passed [expr {$passed && [string equal $ci_description $cal_item(description)]}]
+                set passed [expr {$passed && $ci_description eq $cal_item(description)}]
             }
             aa_true "New individual names are correct" $passed
             
@@ -113,8 +113,8 @@
             set passed 1
             foreach event_id $recurrence_event_ids {
                  calendar::item::get -cal_item_id $event_id -array cal_item
-                set passed [expr {$passed && [string equal $new_names($event_id) $cal_item(name)]}]
-                set passed [expr {$passed && [string equal $ci_description $cal_item(description)]}]
+                set passed [expr {$passed && $new_names($event_id) eq $cal_item(name)}]
+                set passed [expr {$passed && $ci_description eq $cal_item(description)}]
             }
             aa_true "Edited item and New individual names are correct" $passed
 
@@ -129,8 +129,8 @@
             set passed 1
             foreach event_id $recurrence_event_ids {
                  calendar::item::get -cal_item_id $event_id -array cal_item
-                set passed [expr {$passed && [string equal "New Name" $cal_item(name)]}]
-                set passed [expr {$passed && [string equal $ci_description $cal_item(description)]}]
+                set passed [expr {$passed && "New Name" eq $cal_item(name)}]
+                set passed [expr {$passed && $ci_description eq $cal_item(description)}]
             }
             aa_true "Edited item name and New individual names are updated" $passed
 
Index: openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl,v
diff -u -r1.8.4.1 -r1.8.4.2
--- openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl	7 Sep 2013 09:30:37 -0000	1.8.4.1
+++ openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl	3 Oct 2013 07:39:45 -0000	1.8.4.2
@@ -21,8 +21,12 @@
 calendar::item::get -cal_item_id $cal_item_id -array cal_item
 
 set dow_string ""
-foreach dow [list [list "#calendar.Sunday#" 0] [list "#calendar.Monday#" 1] [list "#calendar.Tuesday#" 2] [list "#calendar.Wednesday#" 3] [list "#calendar.Thursday#" 4] [list "#calendar.Friday#" 5] [list "#calendar.Saturday#" 6]] {
-        if {[lindex $dow 1] == [expr "$cal_item(day_of_week) -1"]} {
+foreach dow {
+    {"#calendar.Sunday#" 0} {"#calendar.Monday#" 1} {"#calendar.Tuesday#" 2} 
+    {"#calendar.Wednesday#" 3} {"#calendar.Thursday#" 4} {"#calendar.Friday#" 5}
+    {"#calendar.Saturday#" 6}
+} {
+        if {[lindex $dow 1] == $cal_item(day_of_week) - 1} {
                 set checked_html "CHECKED"
         } else {
                 set checked_html ""
Index: openacs-4/packages/calendar/www/cal-item-new.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/cal-item-new.tcl,v
diff -u -r1.38 -r1.38.4.1
--- openacs-4/packages/calendar/www/cal-item-new.tcl	8 Sep 2008 20:13:37 -0000	1.38
+++ openacs-4/packages/calendar/www/cal-item-new.tcl	3 Oct 2013 07:39:45 -0000	1.38.4.1
@@ -47,7 +47,7 @@
     set calendar_id [lindex [lindex $calendar_options 0] 1]
 }
 # TODO: Move into ad_form
-if { [exists_and_not_null cal_item_id] } {
+if { ([info exists cal_item_id] && $cal_item_id ne "") } {
     set page_title [_ calendar.Calendar_Edit_Item]
     set ad_form_mode display
 } else {
@@ -121,7 +121,7 @@
 
 multirow create time_format_elms name
 
-while { ![empty_string_p $format_string] } {
+while { $format_string ne "" } {
     # Snip off the next token
     regexp {([^/\-.: ]*)([/\-.: ]*)(.*)} \
           $format_string match word sep format_string
@@ -174,11 +174,11 @@
     
     set date [calendar::from_sql_datetime -sql_date $ansi_date  -format "YYY-MM-DD"]
     set repeat_p 0
-    if {[info exists start_time] && ![empty_string_p $start_time] && $start_time != 0} {
+    if {[info exists start_time] && $start_time ne "" && $start_time != 0} {
 	# Set the start time
 	set start_hour $start_time
 	set start_time "{} {} {} $start_time 0 {} {HH24:MI}"
-	set end_time "{} {} {} [expr $start_hour + 1] 0 {} {HH24:MI}"
+	set end_time "{} {} {} [expr {$start_hour + 1}] 0 {} {HH24:MI}"
 	set time_p 1 
     } else {
 	set time_p 0 
@@ -214,7 +214,7 @@
     } else {
 	set js "enableTime('cal_item');"
     }
-    if { [empty_string_p $repeat_p] } {
+    if { $repeat_p eq "" } {
         set repeat_p 0
     } else {
         set repeat_p 1
@@ -263,7 +263,7 @@
     if {$repeat_p} {
         ad_returnredirect [export_vars -base cal-item-create-recurrence { return_url cal_item_id}]
     } else {
-        if { [string compare $return_url "./"] } {
+        if {$return_url ne "./"  } {
     		ad_returnredirect $return_url
     	} else {
 		ad_returnredirect [export_vars -base cal-item-view { cal_item_id }]	
@@ -320,7 +320,7 @@
         -edit_past_events_p $edit_past_events_p \
         -calendar_id $calendar_id
 
-    if { [string compare $return_url "./"] } {
+    if {$return_url ne "./"  } {
     	ad_returnredirect $return_url
     } else {
 	ad_returnredirect [export_vars -base cal-item-view { cal_item_id }]
Index: openacs-4/packages/calendar/www/calendar-item-types.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/calendar-item-types.tcl,v
diff -u -r1.5.2.1 -r1.5.2.2
--- openacs-4/packages/calendar/www/calendar-item-types.tcl	7 Sep 2013 09:30:37 -0000	1.5.2.1
+++ openacs-4/packages/calendar/www/calendar-item-types.tcl	3 Oct 2013 07:39:46 -0000	1.5.2.2
@@ -51,7 +51,7 @@
 foreach item_type $item_types {
     set item_type_id [lindex $item_type 1]
     set type [lindex $item_type 0]
-    if {[empty_string_p $item_type_id]} {
+    if {$item_type_id eq ""} {
         continue
     }
     multirow append item_types "$type" "[_ acs-kernel.common_Delete]" [export_vars -base "item-type-delete" {calendar_id item_type_id}]
Index: openacs-4/packages/calendar/www/mini-calendar.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/mini-calendar.tcl,v
diff -u -r1.20.2.4 -r1.20.2.5
--- openacs-4/packages/calendar/www/mini-calendar.tcl	9 Sep 2013 16:44:26 -0000	1.20.2.4
+++ openacs-4/packages/calendar/www/mini-calendar.tcl	3 Oct 2013 07:39:46 -0000	1.20.2.5
@@ -1,8 +1,8 @@
-if {![exists_and_not_null base_url]} {
+if {(![info exists base_url] || $base_url eq "")} {
     set base_url [ad_conn url]
 }
 
-if {![exists_and_not_null date]} {
+if {(![info exists date] || $date eq "")} {
     set date [dt_sysdate]
 }
 
@@ -20,7 +20,7 @@
 } -on_submit {}
 
 
-if {[exists_and_not_null page_num]} {
+if {([info exists page_num] && $page_num ne "")} {
     set page_num_formvar [export_vars -form {page_num}]
     set page_num "&page_num=$page_num"
 } else {
@@ -29,8 +29,10 @@
 }
 
 # Determine whether we need to pass on the period_days variable from the list view
-if {[string equal $view list]} {
-    if {![exists_and_not_null period_days] || [string equal $period_days [parameter::get -parameter ListView_DefaultPeriodDays -default 31]]} {
+if {$view eq "list"} {
+    if {(![info exists period_days] || $period_days eq "") 
+	|| $period_days eq [parameter::get -parameter ListView_DefaultPeriodDays -default 31]
+    } {
 	set url_stub_period_days ""
     } else {
 	set url_stub_period_days "&period_days=${period_days}"
@@ -49,12 +51,12 @@
 # Create row with existing views
 multirow create views name text active_p url
 foreach viewname {list day week month} {
-    if { [string equal $viewname $view] } {
+    if {$viewname eq $view} {
         set active_p t
     } else {
         set active_p f
     }
-    if {[string equal $viewname list]} {
+    if {$viewname eq "list"} {
 	multirow append views [lang::util::localize $message_key_array($viewname)] $viewname $active_p \
 	    "[export_vars -base $base_url {date {view $viewname}}]${page_num}${url_stub_period_days}"
     } else {
@@ -88,7 +90,7 @@
 
 set today [lc_time_fmt [dt_sysdate] "%q"]
 
-if [string equal $view month] {
+if {$view eq "month"} {
     set prev_year [clock format [clock scan "1 year ago" -base $now] -format "%Y-%m-%d"]
     set next_year [clock format [clock scan "1 year" -base $now] -format "%Y-%m-%d"]
     set prev_year_url "$base_url?view=$view&date=[ad_urlencode $prev_year]${page_num}${url_stub_period_days}"
@@ -104,8 +106,8 @@
 
         # show 3 months in a row
 
-        set new_row_p [expr $i / 3]
-#         if {($i != 0) && ([expr $i % 3] == 0)} {
+        set new_row_p [expr {$i / 3}]
+#         if {($i != 0) && ($i % 3 == 0)} {
 #             set new_row_p t
 #         } else {
 #             set new_row_p f
@@ -117,7 +119,7 @@
             set current_month_p f
         }
         set target_date [clock format \
-                             [clock scan "[expr $i-$curr_month_idx] month" -base $now] -format "%Y-%m-%d"]
+                             [clock scan "[expr {$i-$curr_month_idx}] month" -base $now] -format "%Y-%m-%d"]
         multirow append months $month $current_month_p $new_row_p  \
             "[export_vars -base $base_url {{date $target_date} view}]${page_num}${url_stub_period_days}"
         
@@ -134,7 +136,7 @@
     multirow create days_of_week day_short day_num
     for {set i 0} {$i < 7} {incr i} {
         multirow append days_of_week \
-            [lindex $week_days [expr [expr $i + $first_day_of_week] % 7]] \
+            [lindex $week_days [expr {[expr {$i + $first_day_of_week}] % 7}]] \
             $i
     }
 
@@ -143,14 +145,14 @@
     set day_of_week 1
 
     # Calculate number of active days
-    set active_days_before_month [expr [expr [dt_first_day_of_month $year $month]] -1 ]
-    set active_days_before_month [expr [expr $active_days_before_month + 7 - $first_day_of_week] % 7]
+    set active_days_before_month [expr {[dt_first_day_of_month $year $month] - 1} ]
+    set active_days_before_month [expr {($active_days_before_month + 7 - $first_day_of_week) % 7}]
 
-    set calendar_starts_with_julian_date [expr $first_julian_date_of_month - $active_days_before_month]
-    set day_number [expr $days_in_last_month - $active_days_before_month + 1]
+    set calendar_starts_with_julian_date [expr {$first_julian_date_of_month - $active_days_before_month}]
+    set day_number [expr {$days_in_last_month - $active_days_before_month + 1}]
 
-    for {set julian_date $calendar_starts_with_julian_date} {$julian_date <= [expr $last_julian_date + 7]} {incr julian_date} {
-        if {$julian_date > $last_julian_date_in_month && [string equal $end_of_week_p t] } {
+    for {set julian_date $calendar_starts_with_julian_date} {$julian_date <= $last_julian_date + 7} {incr julian_date} {
+        if {$julian_date > $last_julian_date_in_month && $end_of_week_p eq "t" } {
             break
         }
         set today_p f
@@ -166,7 +168,7 @@
         
         if {$julian_date == $first_julian_date_of_month} {
             set day_number 1
-        } elseif {$julian_date == [expr $last_julian_date_in_month +1]} {
+        } elseif {$julian_date == $last_julian_date_in_month + 1} {
             set day_number 1
         }
 
@@ -203,7 +205,7 @@
 
 set today_url "$base_url?view=day&date=[ad_urlencode [dt_sysdate]]${page_num}${url_stub_period_days}"
 
-if { $view == "day" && [dt_sysdate] == $date } {
+if { $view eq "day" && [dt_sysdate] == $date } {
     set today_p t
 } else {
     set today_p f
Index: openacs-4/packages/calendar/www/navbar.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/navbar.tcl,v
diff -u -r1.4 -r1.4.4.1
--- openacs-4/packages/calendar/www/navbar.tcl	9 Nov 2008 23:29:22 -0000	1.4
+++ openacs-4/packages/calendar/www/navbar.tcl	3 Oct 2013 07:39:46 -0000	1.4.4.1
@@ -1,34 +1,34 @@
 #expects: view
 
-if {![exists_and_not_null base_url]} {
+if {(![info exists base_url] || $base_url eq "")} {
     set base_url [ad_conn url]
 }
 
-if {![exists_and_not_null date]} {
+if {(![info exists date] || $date eq "")} {
     set date [dt_sysdate]
 }
 
-if {[exists_and_not_null page_num]} {
+if {([info exists page_num] && $page_num ne "")} {
     set page_num "&page_num=$page_num"
 } else {
     set page_num ""
 }
 
-if {![exists_and_not_null period_days] || [string equal $period_days [parameter::get -parameter ListView_DefaultPeriodDays -default 31]]} {
+if {(![info exists period_days] || $period_days eq "") || $period_days eq [parameter::get -parameter ListView_DefaultPeriodDays -default 31]} {
     set url_stub_period_days ""
 } else {
     set url_stub_period_days "&period_days=${period_days}"
 }
 
 foreach test_view {list day week month calendar} {
-    if { [string equal $test_view $view] } {
+    if {$test_view eq $view} {
         set ${test_view}_selected_p t
     } else {
         set ${test_view}_selected_p f
     }
 }
 
-if { [string match /dotlrn* $base_url] } {
+if { [string match "/dotlrn*" $base_url] } {
     set link "[export_vars -url -base $base_url -entire_form -exclude {export}]&export=print"
 } else {
     set link "[export_vars -base $base_url {date {view day}}]&export=print"
Index: openacs-4/packages/calendar/www/view-list-display.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/view-list-display.tcl,v
diff -u -r1.33 -r1.33.4.1
--- openacs-4/packages/calendar/www/view-list-display.tcl	16 Jul 2009 11:31:56 -0000	1.33
+++ openacs-4/packages/calendar/www/view-list-display.tcl	3 Oct 2013 07:39:46 -0000	1.33.4.1
@@ -11,25 +11,25 @@
 if { ![info exists show_calendar_name_p] } {
     set show_calendar_name_p 1
 }
-if { ![exists_and_not_null sort_by] } {
+if { (![info exists sort_by] || $sort_by eq "") } {
     set sort_by "start_date"
 }
 
-if { ![exists_and_not_null start_date] } {
+if { (![info exists start_date] || $start_date eq "") } {
     set start_date [clock format [clock seconds] -format "%Y-%m-%d 00:00"]
 }
 
-if { ![exists_and_not_null end_date] } {
+if { (![info exists end_date] || $end_date eq "") } {
     set end_date [clock format [clock scan "+30 days" -base [clock scan $start_date]] -format "%Y-%m-%d 00:00"]
 }
 
-if {[exists_and_not_null calendar_id_list]} {
+if {([info exists calendar_id_list] && $calendar_id_list ne "")} {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_in_portal_calendar] 
 } else {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_calendar] 
 }
 
-#if { ![exists_and_not_null period_days] } {
+#if { (![info exists period_days] || $period_days eq "") } {
 #    set period_days [parameter::get -parameter ListView_DefaultPeriodDays -default 31]
 #}  else {
 #    set end_date [clock format [clock scan "+${period_days} days" -base [clock scan $start_date]] -format "%Y-%m-%d 00:00"]
@@ -40,19 +40,19 @@
 set user_id [ad_conn user_id]
 
 # The title
-if {[empty_string_p $start_date] && [empty_string_p $end_date]} {
+if {$start_date eq "" && $end_date eq ""} {
     set title ""
 }
 
-if {[empty_string_p $start_date] && ![empty_string_p $end_date]} {
+if {$start_date eq "" && $end_date ne ""} {
     set title "[_ acs-datetime.to] [lc_time_fmt $end_date "%q"]"
 }
 
-if {![empty_string_p $start_date] && [empty_string_p $end_date]} {
+if {$start_date ne "" && $end_date eq ""} {
     set title "[_ acs-datetime.Items_from] [lc_time_fmt $start_date "%q"]"
 }
 
-if {![empty_string_p $start_date] && ![empty_string_p $end_date]} {
+if {$start_date ne "" && $end_date ne ""} {
     set title "[_ acs-datetime.Items_from] [lc_time_fmt $start_date "%q"] [_ acs-datetime.to] [lc_time_fmt $end_date "%q"]"
 }
 
@@ -84,7 +84,7 @@
 set interval_limitation_clause [db_map dbqd.calendar.www.views.list_interval_limitation]
 set order_by_clause " order by $sort_by"
 set additional_limitations_clause ""
-if { [exists_and_not_null cal_system_type] } {
+if { ([info exists cal_system_type] && $cal_system_type ne "") } {
     append additional_limitations_clause " and system_type = :cal_system_type "
 }
 
@@ -118,15 +118,15 @@
         set pretty_end_time "--"
     }
 
-    if {[string equal $pretty_start_time "00:00"]} {
+    if {$pretty_start_time eq "00:00"} {
         set pretty_start_time "--"
     }
 
-    if {[string equal $pretty_end_time "00:00"]} {
+    if {$pretty_end_time eq "00:00"} {
         set pretty_end_time "--"
     }
 
-    if {![string equal $pretty_start_date $last_pretty_start_date]} {
+    if {$pretty_start_date ne $last_pretty_start_date } {
         set last_pretty_start_date $pretty_start_date
     }
 
@@ -205,7 +205,7 @@
     set period_url_$i "[export_vars -base $self_url -url -entire_form {{period_days $i}}]\#calendar"
 }
 
-if { [info exists export] && [string equal $export print] } {
+if { [info exists export] && $export eq "print" } {
     set print_html [template::adp_parse [acs_root_dir]/packages/calendar/www/view-print-display [list &items items show_calendar_name_p $show_calendar_name_p]]
     ns_return 200 text/html $print_html
     ad_script_abort
@@ -216,7 +216,7 @@
 
 
     set the_form [ns_getform]
-    if { ![empty_string_p $the_form] } {
+    if { $the_form ne "" } {
 	for { set i 0 } { $i < [ns_set size $the_form] } { incr i } {
 	    set varname [ns_set key $the_form $i]
 	    set varvalue [ns_set value $the_form $i]
Index: openacs-4/packages/calendar/www/view-month-display.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/view-month-display.tcl,v
diff -u -r1.25 -r1.25.4.1
--- openacs-4/packages/calendar/www/view-month-display.tcl	9 Nov 2008 23:29:22 -0000	1.25
+++ openacs-4/packages/calendar/www/view-month-display.tcl	3 Oct 2013 07:39:46 -0000	1.25.4.1
@@ -1,13 +1,13 @@
 
 set system_type ""
-if {![info exists date] || [empty_string_p $date]} {
+if {![info exists date] || $date eq ""} {
     # Default to todays date in the users (the connection) timezone
     set server_now_time [dt_systime]
     set user_now_time [lc_time_system_to_conn $server_now_time]
     set date [lc_time_fmt $user_now_time "%x"]
 }
 
-if { [exists_and_not_null export] } {
+if { ([info exists export] && $export ne "") } {
     set exporting_p 1
 } else {
     set exporting_p 0
@@ -23,7 +23,7 @@
     set show_calendar_name_p 1
 }
 
-if {[exists_and_not_null calendar_id_list]} {
+if {([info exists calendar_id_list] && $calendar_id_list ne "")} {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_in_portal_calendar] 
 } else {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_calendar] 
@@ -34,7 +34,7 @@
 set this_month [dt_trim_leading_zeros [lindex $date_list 1]]
 set this_day [dt_trim_leading_zeros [lindex $date_list 2]]
 
-set month_string [lindex [dt_month_names] [expr $this_month - 1]]
+set month_string [lindex [dt_month_names] $this_month-1]
 
 set package_id [ad_conn package_id]
 set user_id [ad_conn user_id]
@@ -44,7 +44,7 @@
 set next_month_url ?[export_vars {{view month} {date $next_month} page_num}]
 
 set first_day_of_week [lc_get firstdayofweek]
-set last_day_of_week [expr [expr $first_day_of_week + 6] % 7]
+set last_day_of_week [expr {[expr {$first_day_of_week + 6}] % 7}]
 
 set week_days [lc_get day]
 multirow create weekday_names weekday_num weekday_long
@@ -93,7 +93,7 @@
 
 # Calculate number of greyed days and then add them to the calendar mulitrow
 set greyed_days_before_month [expr [expr [dt_first_day_of_month $this_year $this_month]] -1 ]
-set greyed_days_before_month [expr [expr $greyed_days_before_month + 7 - $first_day_of_week] % 7]
+set greyed_days_before_month [expr {[expr {$greyed_days_before_month + 7 - $first_day_of_week}] % 7}]
 
 if { !$exporting_p } {
 
@@ -216,7 +216,7 @@
         $display_information(today_p) \
         f \
         $time_p \
-        [export_vars -base ${calendar_url}cal-item-new {{date $current_day_ansi} {start_time ""} {end_time ""}}]" \
+        [export_vars -base ${calendar_url}cal-item-new {{date $current_day_ansi} {start_time ""} {end_time ""}}] \
         ?[export_vars {{view day} {date $current_day_ansi} page_num}] \
         "calendar-${system_type}Item" \
         $num_attachments \
@@ -262,10 +262,10 @@
     }
 
     # Add cells for remaining days outside the month
-    set remaining_days [expr [expr $first_day_of_week + 6 - $current_day % 7] % 7]
+    set remaining_days [expr {[expr {$first_day_of_week + 6 - $current_day % 7}] % 7}]
     
     if {$remaining_days > 0} {
-        for {} {$current_day <= [expr $last_julian_date_in_month + $remaining_days]} {incr current_day} {
+        for {} {$current_day <= $last_julian_date_in_month + $remaining_days} {incr current_day} {
             multirow append items \
                 "" \
                 "" \
@@ -292,7 +292,7 @@
     }
 }
 
-if { [info exists export] && [string equal $export print] } {
+if { [info exists export] && $export eq "print" } {
     set print_html [template::adp_parse [acs_root_dir]/packages/calendar/www/view-print-display [list &items items show_calendar_name_p $show_calendar_name_p]]
     ns_return 200 text/html $print_html
     ad_script_abort
Index: openacs-4/packages/calendar/www/view-one-day-display.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/view-one-day-display.tcl,v
diff -u -r1.40 -r1.40.2.1
--- openacs-4/packages/calendar/www/view-one-day-display.tcl	10 Oct 2009 22:38:09 -0000	1.40
+++ openacs-4/packages/calendar/www/view-one-day-display.tcl	3 Oct 2013 07:39:46 -0000	1.40.2.1
@@ -33,13 +33,13 @@
     set end_display_hour 23
 }
 
-if {[exists_and_not_null calendar_id_list]} {
+if {([info exists calendar_id_list] && $calendar_id_list ne "")} {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_in_portal_calendar] 
 } else {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_calendar] 
 }
 
-if {[empty_string_p $date]} {
+if {$date eq ""} {
     # Default to todays date in the users (the connection) timezone
     set server_now_time [dt_systime]
     set user_now_time [lc_time_system_to_conn $server_now_time]
@@ -72,7 +72,7 @@
 # Loop through the items without time
 
 set additional_limitations_clause " and to_char(start_date, 'HH24:MI') = to_char(end_date, 'HH24:MI')"
-if { [exists_and_not_null cal_system_type] } {
+if { ([info exists cal_system_type] && $cal_system_type ne "") } {
     append additional_limitations_clause " and system_type = :cal_system_type "
 }
 set additional_select_clause ""
@@ -114,7 +114,7 @@
 }
 
 set additional_limitations_clause " and to_char(start_date, 'HH24:MI') <> to_char(end_date, 'HH24:MI')"
-if { [exists_and_not_null cal_system_type] } {
+if { ([info exists cal_system_type] && $cal_system_type ne "") } {
     append additional_limitations_clause " and system_type = :cal_system_type "
 }
 set order_by_clause " order by to_char(start_date,'HH24:MI')"
@@ -159,7 +159,7 @@
                  + ($start_minutes*$hour_height_inside/60)]
     set bottom [expr ($end_hour * ($hour_height_inside+$hour_height_sep)) \
                  + ($end_minutes*$hour_height_inside/60)]
-    set height [expr $bottom - $top - 2]
+    set height [expr {$bottom - $top - 2}]
 
     set bump_right $bump_right_base
     foreach {previous_start previous_end} $previous_intervals {
@@ -197,7 +197,7 @@
     } else {
         set currval [multirow get items $i top]
         multirow set items $i top \
-            [expr $currval - ($adjusted_start_display_hour*($hour_height_inside+$hour_height_sep))]
+            [expr {$currval - ($adjusted_start_display_hour*($hour_height_inside+$hour_height_sep))}]
     }
 }
 
@@ -225,7 +225,7 @@
         [export_vars -base ${calendar_url}cal-item-new {{date $current_date} {start_time $grid_hour}}]
 }
 
-if { [info exists export] && [string equal $export print] } {
+if { [info exists export] && $export eq "print" } {
     set print_html [template::adp_parse [acs_root_dir]/packages/calendar/www/view-print-display [list &items items show_calendar_name_p $show_calendar_name_p]]
     ns_return 200 text/html $print_html
     ad_script_abort
Index: openacs-4/packages/calendar/www/view-week-display.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/view-week-display.tcl,v
diff -u -r1.25 -r1.25.2.1
--- openacs-4/packages/calendar/www/view-week-display.tcl	10 Oct 2009 22:38:09 -0000	1.25
+++ openacs-4/packages/calendar/www/view-week-display.tcl	3 Oct 2013 07:39:46 -0000	1.25.2.1
@@ -29,13 +29,13 @@
     set show_calendar_name_p 1
 }
 
-if {[exists_and_not_null calendar_id_list]} {
+if {([info exists calendar_id_list] && $calendar_id_list ne "")} {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_in_portal_calendar] 
 } else {
     set calendars_clause [db_map dbqd.calendar.www.views.openacs_calendar] 
 }
 
-if {[empty_string_p $date]} {
+if {$date eq ""} {
     # Default to todays date in the users (the connection) timezone
     set server_now_time [dt_systime]
     set user_now_time [lc_time_system_to_conn $server_now_time]
@@ -52,7 +52,7 @@
 
 set first_day_of_week [lc_get firstdayofweek]
 set first_us_weekday [lindex [lc_get -locale en_US day] $first_day_of_week]
-set last_us_weekday [lindex [lc_get -locale en_US day] [expr [expr $first_day_of_week + 6] % 7]]
+set last_us_weekday [lindex [lc_get -locale en_US day] [expr {[expr {$first_day_of_week + 6}] % 7}]]
 
 db_1row select_weekday_info {}
 db_1row select_week_info {}
@@ -89,7 +89,7 @@
 set interval_limitation_clause [db_map dbqd.calendar.www.views.week_interval_limitation]
 set additional_limitations_clause ""
 set additional_select_clause [db_map dow]
-if { [exists_and_not_null cal_system_type] } {
+if { ([info exists cal_system_type] && $cal_system_type ne "") } {
     append additional_limitations_clause " and system_type = :cal_system_type "
 }
 
@@ -113,7 +113,7 @@
     scan [lc_time_fmt $ansi_start_date "%H"] %d start_hour
     scan [lc_time_fmt $ansi_end_date "%H"] %d end_hour
 
-    set ansi_this_date [dt_julian_to_ansi [expr $first_weekday_julian + $current_weekday]]
+    set ansi_this_date [dt_julian_to_ansi [expr {$first_weekday_julian + $current_weekday}]]
 
     if { $start_time eq $end_time } {
         set no_time_p t
@@ -166,7 +166,7 @@
                  + ($top_minutes*$hour_height_inside/60)]
     set bottom [expr ($bottom_hour * ($hour_height_inside+$hour_height_sep)) \
                     + ($bottom_minutes*$hour_height_inside/60)]
-    set height [expr $bottom - $top - 3]
+    set height [expr {$bottom - $top - 3}]
 
     set left $event_left_base
 
@@ -192,8 +192,8 @@
             set max_bumps $bumps
         }
     }
-    incr top [expr $bumps*5]
-    incr left [expr $bumps*$event_bump_delta]
+    incr top [expr {$bumps*5}]
+    incr left [expr {$bumps*$event_bump_delta}]
 
     set event_url [export_vars -base [site_node::get_url_from_object_id -object_id $cal_package_id]cal-item-view {return_url {cal_item_id $item_id}}]
 
@@ -236,15 +236,15 @@
     } else {
         set currval [multirow get items $i top]
         multirow set items $i top \
-            [expr $currval - ($adjusted_start_display_hour*($hour_height_inside+$hour_height_sep))]
+            [expr {$currval - ($adjusted_start_display_hour*($hour_height_inside+$hour_height_sep))}]
     }
 }
 
 # Navigation Bar
 set dates "[lc_time_fmt $first_weekday_date "%q"] - [lc_time_fmt $last_weekday_date "%q"]"
-set prev_date_ansi [ad_urlencode [dt_julian_to_ansi [expr $first_weekday_julian - 7]]]
+set prev_date_ansi [ad_urlencode [dt_julian_to_ansi [expr {$first_weekday_julian - 7}]]]
 set previous_week_url ?[export_vars {page_num {view week} {date $prev_date_ansi}}]\#calendar
-set next_date_ansi [ad_urlencode [dt_julian_to_ansi [expr $first_weekday_julian + 7]]]
+set next_date_ansi [ad_urlencode [dt_julian_to_ansi [expr {$first_weekday_julian + 7}]]]
 set next_week_url ?[export_vars {page_num {view week} {date $next_date_ansi}}]\#calendar
 
 #Calendar grid.
@@ -268,15 +268,15 @@
 
 set week_days [lc_get abday]
 set first_weekday_date_secs [clock scan "-24 hours" -base [clock scan "1 day" -base [clock scan $first_weekday_date]]]
-set next_week [clock format [expr $first_weekday_date_secs + (7*86400)] -format "%Y-%m-%d"]
-set last_week [clock format [expr $first_weekday_date_secs - (7*86400)] -format "%Y-%m-%d"]
+set next_week [clock format [expr {$first_weekday_date_secs + (7*86400)}] -format "%Y-%m-%d"]
+set last_week [clock format [expr {$first_weekday_date_secs - (7*86400)}] -format "%Y-%m-%d"]
 
 multirow create days_of_week width day_short monthday weekday_date weekday_url day_num
 
 set nav_url_base [ad_conn url]?[export_vars -url -entire_form -exclude {date view}]
 
 for {set i 0} {$i < 7} {incr i} {
-    set weekday_secs [expr $first_weekday_date_secs + ($i*86400)]
+    set weekday_secs [expr {$first_weekday_date_secs + ($i*86400)}]
     set trimmed_month \
         [string trimleft [clock format $weekday_secs -format "%m"] 0]
     set trimmed_day \
@@ -294,7 +294,7 @@
     incr week_width [set day_width_$i]
 }
 
-if { [info exists export] && [string equal $export print] } {
+if { [info exists export] && $export eq "print" } {
     set print_html [template::adp_parse [acs_root_dir]/packages/calendar/www/view-print-display [list &items items show_calendar_name_p $show_calendar_name_p]]
     ns_return 200 text/html $print_html
     ad_script_abort
Index: openacs-4/packages/calendar/www/view.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/view.tcl,v
diff -u -r1.30 -r1.30.4.1
--- openacs-4/packages/calendar/www/view.tcl	10 Jul 2009 12:54:07 -0000	1.30
+++ openacs-4/packages/calendar/www/view.tcl	3 Oct 2013 07:39:46 -0000	1.30.4.1
@@ -14,7 +14,7 @@
     {period_days:integer {[parameter::get -parameter ListView_DefaultPeriodDays -default 31]}}
 } -validate {
     valid_date -requires { date } {
-        if {![string equal $date ""]} {
+        if {$date ne "" } {
             if {[catch {set date [clock format [clock scan $date] -format "%Y-%m-%d"]} err]} {
                 ad_complain "Your input was not valid. It has to be in the form YYYYMMDD."
             }
@@ -29,7 +29,7 @@
 
 set export [ns_queryget export]
 
-if {$export == "print"} {
+if {$export eq "print"} {
     set view "list"
 }
 
@@ -42,16 +42,16 @@
 
 set date [calendar::adjust_date -date $date]
 
-if {$view == "list"} {
-    if {[empty_string_p $start_date]} {
+if {$view eq "list"} {
+    if {$start_date eq ""} {
         set start_date $date
     }
 
     set ansi_list [split $start_date "- "]
     set ansi_year [lindex $ansi_list 0]
     set ansi_month [string trimleft [lindex $ansi_list 1] "0"]
     set ansi_day [string trimleft [lindex $ansi_list 2] "0"]
-    set end_date [dt_julian_to_ansi [expr [dt_ansi_to_julian $ansi_year $ansi_month $ansi_day ] + $period_days]]
+    set end_date [dt_julian_to_ansi [expr {[dt_ansi_to_julian $ansi_year $ansi_month $ansi_day ] + $period_days}]]
 }
 if { $user_id eq 0 } {
     set calendar_personal_p 0
Index: openacs-4/packages/calendar/www/admin/calendar-create.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/admin/calendar-create.tcl,v
diff -u -r1.1.1.1 -r1.1.1.1.24.1
--- openacs-4/packages/calendar/www/admin/calendar-create.tcl	23 Apr 2001 23:09:38 -0000	1.1.1.1
+++ openacs-4/packages/calendar/www/admin/calendar-create.tcl	3 Oct 2013 07:39:46 -0000	1.1.1.1.24.1
@@ -30,13 +30,13 @@
 # if the permission is private, we would have to wait until
 # the user selects an audience.
 
-if { [string equal $calendar_permission "public"]} {
+if {$calendar_permission eq "public"} {
 
     # assign the permission to the calendar
     calendar_assign_permissions $calendar_id $party_id $calendar_permission
     ad_returnredirect  "one?action=permission&calendar_id=$calendar_id"
 
-} elseif { [string equal $calendar_permission "private"]} {
+} elseif {$calendar_permission eq "private"} {
 
     # this would be a special case where they'd have to select their audience first
     ad_returnredirect  "one?action=permission&calendar_id=$calendar_id&calendar_permission=private"