function doClick1(o){
	 o.className="isshow";
	 var j;
	 var id;
	 var b;
	 for(var i=1;i<=5;i++){
	   id ="n"+i;
	   j = document.getElementById(id);
	   b = document.getElementById("nn"+i);
	   if(id != o.id){
	   	 j.className="noshow";
	     b.style.visibility = "hidden";
	   }
	   else{
			b.style.visibility = "visible";
			}
	 }
}