function $_class(name){
				 var elements = document.getElementsByTagName("*");
				 for(s=0;s<elements.length;s++){
				  if(elements[s].className==name){
				   return  elements[s];
				  }
				 }
				}
				//tab effects
				var tabList = $_class("menu_net").getElementsByTagName("li")
				 tabCon = $_class("sub_zzjs").getElementsByTagName("ul");
				for(i=0;i<tabList.length;i++){
				 (function(){
				  var t = i;
				  tabList[t].onmouseover = function(){
				   for(o=0;o<tabCon.length;o++){
					tabCon[o].style.display = "none";
					tabList[o].className = "";
					if(t==o){
					 this.className = "this_zzjs";
					 tabCon[o].style.display = "block";
					}
				   }
				  }
				 })()
				}