var debug = false ;
function switchTab (tab)
{
	var tabName = getTabGroupName (tab.id) ;
	if (tabName == '')
	{	alert ("No tabName for tab [" + tab.id + "]") ;
	return ;
	}
	var index = 1 ;
	while (true)
	{	var tabTitle = eval ("document.all ('" + tabName + '_' + index + "')") ;
	if (tabTitle == undefined)
	break ;
	deactiveTabTitle (tabTitle , tabName) ;
	var tabContent = eval ("document.all ('" + tabName + '_' + index + '_content' + "')") ;
	if (tabContent != undefined)
	tabContent.style.display = "NONE" ;
	index ++ ;
	}
	if (debug)
	alert ("Find " + (index - 1) + " tab title(s) for TabName [" + tabName + "]") ;
	activeTabTitle (tab , tabName) ;
	var tabContent = eval ("document.all ('" + tab.id + '_content' + "')") ;
	if (tabContent != undefined)
	tabContent.style.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" ;
}

function activeTabTitle (tab , tabName)
{
	tab.className = tabName + "_on" ;
}