function navFun(liselected){

  var imgLoadSrc=new Array()
  imgLoadSrc.push("images/navon.gif");
  var lis = $(".menu div>a:not(.clear)");
  selectFun(lis,liselected)
  lis.each(function(i){
		  var n=i+1;
		  imgLoadSrc.push("images/nav"+n+"_2.jpg");
		  $(this).hover(function(){
								 $("img",this).eq(0).attr('src','images/nav'+n+'_2.jpg')
							 },
					function(){
						if(n!=liselected){
							$("img",this).eq(0).attr('src','images/nav'+n+'.jpg')
							}
		  
						}
					)

		  });
  preloader(imgLoadSrc)
}
function selectFun(obj,selectedIndex){
  $("img",obj.eq(selectedIndex-1)).attr('src','images/nav'+selectedIndex+'_2.jpg')
}
navFun()
function preloader() {//预加载图片
  
  var Arrimg=new Array();   
  if(typeof(arguments[0])=="string")Arrimg[0]=arguments[0];   
  if(typeof(arguments[0])=="object"){   
	for(var i=0;i<arguments[0].length;i++){   
		Arrimg[i]=arguments[0][i]   
	  }   
  } 
  
  var images = new Array(); 
  for(var i=0;i<Arrimg.length;i++)
  {
	//alert(Arrimg[i])
	images[i]=new Image();
	images[i].src=Arrimg[i];
  }

}