//nav start controling
$(function()
{	
	//default
	$(".nav a").addClass(function(num)
	{
		return "menu_" + num;								
	});
	
	//link hover
	$(".nav a").hover(function()
	{	
		var i = $(this).index();					   
		$(this).addClass("menu_" + i + i);							 
	},function()
	{
		var i = $(this).index();
		$(this).removeClass("menu_" + i + i);
	});
	
})

	var listm;
	function w(vd){
	  if(listm)document.getElementById(listm).style.display="none";
	  listm=vd;
	
	  var ob=document.getElementById(vd);
	  if(ob.style.display=="block" || ob.style.display==""){
		 ob.style.display="none";
		 var ob2=document.getElementById('s'+vd);
		 //ob2.style.backgroundImage="url(/images/jia.gif)";
	  }else{
		ob.style.display="block";
		var ob2=document.getElementById('s'+vd);
		//ob2.style.backgroundImage="url(/images/jian.gif)";
	  }
	}