var bPrev;
var btbPrev;
var cPrev;
var ctbPrev;

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);
}

function hcc(time,obj){
	if(cPrev==null){
		cPrev=document.getElementById("cct").getElementsByTagName("li")[0]
	}
	if(ctbPrev==null){
		ctbPrev=document.getElementById("ctb").getElementsByTagName("div")[0]
	}
	cPrev.className="";	
	ctbPrev.style.display="none";
	obj.className="cct_a";
	document.getElementById(time).style.display="block";
	cPrev=obj;
	ctbPrev=document.getElementById(time);
}