//tab显示层
var layers = ["i_about","i_news","faq"];
function showLayer(obj){
	for(var i = 0;i<layers.length;i++){
		ads.$(layers[i]).style.display = "none";
		}
	ads.$(obj).style.display = "";
}
ads.addEvent(window,"load",function(){
	var tabs = ads.$t("li","gridTab");
	tabs[0].className = "here";
	for(var i = 0; i < tabs.length; i++){
		tabs[i].index = i;
		ads.addEvent(tabs[i],"mouseover",function(){
			for(var i = 0; i < tabs.length; i++){
				tabs[i].className = "";
				}
			this.className = "here";
			showLayer(layers[this.index]);
			})
		}
	})