function doClick(o)
{
	 o.className="nav_current";
	 var j;
	 var id;
	 var e;
	 for(var i=1;i<=3;i++)
	 { //i<10 多少个栏目就填多大值
	     id ="nav"+i;
	     j = document.getElementById(id);
	     e = document.getElementById("sub"+i);
	     if(id != o.id)
		 {
	   	     j.className = "nav_link";
	   	     e.style.display = "none";
	     }
		 else
		 {
		     e.style.display = "block";
	     }
	 }
}// * www.divcss5.com */