// JavaScript Document

var objHideSub;//隐藏 子菜单 延时对象
	
	$(function(){
			   $("#mainNav>li")
			   .hover(
					  function(){
						  ShowSub($(this).children("ul"));
						  },
					  function(){
						  HideSub($(this).children("ul"));
						  }
					  );
			   
			   $("#mainNav>li>a")
			   .next("ul")
			   .hover(
					  function(){
						  objHideSub = null;
						  },
					  function(){
						  HideSub($(this));
						  }
					  );
												   
			   });
	
	
	
	var ShowSub = function(sb){
//		$(sb).togle();
		sb.show("fast");//.show();
		};
		
	var HideSub = function(sb){
//		$(sb).togle();
		sb.hide("fast");//.show();
		objHideSub = setTimeout(sb.hide('fast'),500);
		};