var myNav = document.getElementById("nav").getElementsByTagName("a"); 
				for(var i=0;i<myNav.length;i++) { 
					var links = myNav[i].getAttribute("href");
					var myURL = document.location.href; 
					if(myURL=="http://www.wl0571.com/"){
						myNav[0].className="first";}					
					if(myURL==links) { 
						myNav[i].className="first"; 
					}
				}