diff --git a/mozilla/calendar/resources/content/monthView.js b/mozilla/calendar/resources/content/monthView.js
index d29ff2badf5..bb138c6e43c 100644
--- a/mozilla/calendar/resources/content/monthView.js
+++ b/mozilla/calendar/resources/content/monthView.js
@@ -525,9 +525,9 @@ MonthView.prototype.refreshDisplay = function monthView_refreshDisplay( )
       }
     }
     if(!isSixthWeekDisplayed) {
-      document.getElementById( "month-week-6-row" ).setAttribute( "collapsed", "true" );
+      document.getElementById( "month-week-6-row" ).setAttribute( "hidden", "true" );
     } else {
-      document.getElementById( "month-week-6-row" ).removeAttribute( "collapsed" );
+      document.getElementById( "month-week-6-row" ).removeAttribute( "hidden" );
     }
 
     // fifth week should not display if holds only off days and only work days displayed
@@ -543,9 +543,9 @@ MonthView.prototype.refreshDisplay = function monthView_refreshDisplay( )
       }
     }
     if(!isFifthWeekDisplayed) {
-      document.getElementById( "month-week-5-row" ).setAttribute( "collapsed", "true" );
+      document.getElementById( "month-week-5-row" ).setAttribute( "hidden", "true" );
     } else {
-      document.getElementById( "month-week-5-row" ).removeAttribute( "collapsed" );
+      document.getElementById( "month-week-5-row" ).removeAttribute( "hidden" );
     }
   }
 
diff --git a/mozilla/calendar/resources/content/multiweekView.js b/mozilla/calendar/resources/content/multiweekView.js
index d65f29ec2bb..8d60ce25c4c 100644
--- a/mozilla/calendar/resources/content/multiweekView.js
+++ b/mozilla/calendar/resources/content/multiweekView.js
@@ -530,11 +530,11 @@ MultiweekView.prototype.refreshDisplay = function multiweekView_refreshDisplay(
    var weekIndex;
    for( weekIndex = 1 ;  weekIndex <= this.WeeksInView ; ++weekIndex )
    {
-     document.getElementById( "multiweek-week-" + weekIndex + "-row" ).removeAttribute( "collapsed" );
+     document.getElementById( "multiweek-week-" + weekIndex + "-row" ).removeAttribute( "hidden" );
    }
    for( weekIndex = this.WeeksInView + 1 ; weekIndex <= 6 ; ++weekIndex )
    {
-     document.getElementById( "multiweek-week-" + weekIndex + "-row" ).setAttribute( "collapsed", "true" );
+     document.getElementById( "multiweek-week-" + weekIndex + "-row" ).setAttribute( "hidden", "true" );
    }
 
    // read preference for previous weeks in view