var tabBGImagePath = "" ;
var tabBGImageType = "_bg.gif" ;
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 = document.getElementById (tabName + '_' + index) ;
		if (tabTitle == undefined)
			break ;
		deonTabTitle (tabTitle , tabName) ;
		var tabContent = document.getElementById (tabName + '_' + index + '_content') ;
		if (tabContent != undefined)
			tabContent.style.display = "NONE" ;
		index ++ ;
	}
	
	if (debug)
		alert ("Find " + (index - 1) + " tab title(s) for TabName [" + tabName + "]") ;
	onTabTitle (tab , tabName) ;
	var tabContent = document.getElementById (tab.id + '_content') ;
	if (tabContent != undefined)
		tabContent.style.display = "BLOCK" ;
	var tabHeader = document.getElementById (tabName + "_header") ;
	if (tabHeader != undefined)
	{
		tabHeader.className = "tabheader_" + tab.id ; 
	}
}
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 deonTabTitle (tab , tabName)
{
	tab.className = tabName + "_off" ;
}
function onTabTitle (tab , tabName)
{
	tab.className = tabName + "_on" ;
}