Index: openacs-4/packages/xowiki/www/portlets/weblog-mini-calendar.adp
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/www/portlets/Attic/weblog-mini-calendar.adp,v
diff -u -r1.1 -r1.2
--- openacs-4/packages/xowiki/www/portlets/weblog-mini-calendar.adp	30 Apr 2006 23:53:35 -0000	1.1
+++ openacs-4/packages/xowiki/www/portlets/weblog-mini-calendar.adp	14 Sep 2008 08:59:17 -0000	1.2
@@ -4,11 +4,15 @@
       <table class="header" cellspacing="0" cellpadding="0">
         <tr>
             <td class="back">
+	      <if @prev_month_url@ ne "">
               <a href="@prev_month_url@"><img border=0 src="/resources/acs-subsite/left.gif" alt="#calendar.prev_month#"></a>
+	    </if>
             </td>
             <td class="current_view" colspan="2">@curr_month@ @year@</td>
             <td class="forward">
+	      <if @next_month_url@ ne "">
               <a href="@next_month_url@"><img border=0 src="/resources/acs-subsite/right.gif" alt="#calendar.next_month#"></a>
+	    </if>
             </td>
         </tr>
       </table>
Index: openacs-4/packages/xowiki/www/portlets/weblog-mini-calendar.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/www/portlets/Attic/weblog-mini-calendar.tcl,v
diff -u -r1.10 -r1.11
--- openacs-4/packages/xowiki/www/portlets/weblog-mini-calendar.tcl	28 Sep 2007 20:34:07 -0000	1.10
+++ openacs-4/packages/xowiki/www/portlets/weblog-mini-calendar.tcl	14 Sep 2008 08:59:17 -0000	1.11
@@ -1,3 +1,12 @@
+#
+# The following time range specifies the dates between the navigation
+# arrows of the weblog mini calendar should be. Without a limitation,
+# crawler will iterate over this pages until they reach infinite past
+# or infinite future. 
+#
+set earliest_date "2006-01-1"
+set latest_date   "1 year"
+
 ::xo::Page requireCSS "/resources/calendar/calendar.css"
 set package_id        [::xo::cc package_id]
 set folder_id         [$__including_page set parent_id]
@@ -13,12 +22,6 @@
   set date [dt_sysdate]
 } 
 
-#if {[exists_and_not_null page_num]} {
-#    set page_num "&page_num=$page_num"
-#} else {
-#    set page_num ""
-#}
-
 array set message_key_array {
     list #acs-datetime.List#
     day #acs-datetime.Day#
@@ -35,21 +38,34 @@
 }
 
 set now       [clock scan $date]
+set prev_mon  [clock scan "1 month ago" -base $now]
+set next_mon  [clock scan "1 month" -base $now]
+
+set earliest_date "2008-08-1"
+set latest_date "1 month"
+
 set date_list [dt_ansi_to_list $date]
 set year      [dt_trim_leading_zeros [lindex $date_list 0]]
 set month     [dt_trim_leading_zeros [lindex $date_list 1]]
 set day       [dt_trim_leading_zeros [lindex $date_list 2]]
 
-set months_list [dt_month_names]
-set curr_month_idx  [expr {[dt_trim_leading_zeros [clock format $now -format "%m"]]-1}]
+set months_list    [dt_month_names]
+set curr_month_idx [expr {[dt_trim_leading_zeros [clock format $now -format "%m"]]-1}]
+set curr_month     [lindex $months_list $curr_month_idx ]
 
-set curr_month [lindex $months_list $curr_month_idx ]
-set prev_month [clock format [clock scan "1 month ago" -base $now] -format "%Y-%m-%d"]
-set next_month [clock format [clock scan "1 month" -base $now] -format "%Y-%m-%d"]
-set prev_month_url [export_vars -base $base_url {{date $prev_month} page_num summary}]
-set next_month_url [export_vars -base $base_url {{date $next_month} page_num summary}]
-#set next_month_url "$base_url?date=[ad_urlencode $next_month]${page_num}"
-    
+if {$prev_mon < [clock scan $earliest_date]} {
+  set prev_month_url ""
+} else {
+  set prev_month     [clock format $prev_mon -format "%Y-%m-%d"]
+  set prev_month_url [export_vars -base $base_url {{date $prev_month} page_num summary}]
+}
+if {$next_mon > [clock scan $latest_date]} {
+  set next_month_url ""
+} else {
+  set next_month     [clock format $next_mon -format "%Y-%m-%d"]
+  set next_month_url [export_vars -base $base_url {{date $next_month} page_num summary}]
+}
+
 set first_day_of_week [lc_get firstdayofweek]
 set week_days [lc_get abday]
 multirow create days_of_week day_short