var ePrev;
var etbPrev;
function expo(time,obj){
	if(ePrev==null){
		ePrev=document.getElementById("ebt").getElementsByTagName("li")[0]
	}
	if(etbPrev==null){
		etbPrev=document.getElementById("etb").getElementsByTagName("div")[0]
	}
	ePrev.className="";	
	etbPrev.style.display="none";
	obj.className="ebt_a";
	document.getElementById(time).style.display="block";
	ePrev=obj;
	etbPrev=document.getElementById(time);
}
<!--
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
//-->

function open_window2(url,windowname,size)     
  {     
  window.open(url,windowname,"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=yes,top=10,left=10,"+   size);     
  } 
  
var bPrev;
var btbPrev;
function hc(time,obj){
	if(bPrev==null){
		bPrev=document.getElementById("bbt").getElementsByTagName("li")[0]
	}
	if(btbPrev==null){
		btbPrev=document.getElementById("btb").getElementsByTagName("div")[0]
	}
	bPrev.className="";	
	btbPrev.style.display="none";
	obj.className="bbt_a";
	document.getElementById(time).style.display="block";
	bPrev=obj;
	btbPrev=document.getElementById(time);
}