rem: if (holderBox) 
add: if (holderBox) { 
context: function changeToolTipTextForEvent( event ){   var thisEvent = getCalendarEventFromEvent( event );      var toolTip = document.getElementById( "eventTreeTooltip" );   while( toolTip.hasChildNodes() )   {      toolTip.removeChild( toolTip.firstChild );   }   var holderBox = getPreviewForEvent( thisEvent );   if (holderBox)     toolTip.appendChild( holderBox );}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/b7070e63340273af8742d3f5d476a74f7a1c924f/unifinder.js/clean/calendar/resources/content/unifinder.js