/* 4-------------------------- 最新展会|专题展会|展会知识---------------------------- */
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);
}