var classname="";
	function switchTab (tab)
	{		 
		var tabName = getTabGroupName (tab.id) ;
		if(tabName=="")return;
		var index = 1 ;
		var targetID="";
		while (true)
		{
		    targetID="#"+tabName+"_"+index;
		    if($(targetID).size()==0)break;
			deactiveTabTitle ($(targetID)[0] , tabName) ;
			targetID+="_content";
			$(targetID).css({display:"none"});
			index ++ ;
		}
		activeTabTitle (tab , tabName) ;
		targetID="#"+tab.id+"_content";
		$(targetID).css({display:"block"});
	}	
	function getTabGroupName (tabId)
	{
		if (tabId == '' || tabId == undefined)
		{
			alert ("tabId is NULL! [" + tabId + "]") ;
			return ;
		}
		var i = tabId.lastIndexOf ('_') ;
		if (i <= 1)
			return '' ;
		return tabId.substr (0 , i) ;
	}
	function deactiveTabTitle (tab , tabName)
	{	//	tab.className = tabName + "_off" ;
		classname=tab.className;
		tab.className = classname.replace("on","off") ;
	}
	
	function activeTabTitle (tab , tabName)
	{	//	tab.className = tabName + "_on" ;
		classname=tab.className;
		tab.className = classname.replace("off","on") ;
	}
// -->