var img_open=new Image();
var img_close=new Image();
img_open.src="images/threemenu/open.jpg";
img_close.src="images/threemenu/close.jpg";
function changeDisplay(spanid){
	
		spanOjb=document.getElementById(spanid);
		imgOjb=document.getElementById("img_"+spanid);
		if(spanOjb==null){
			return true;
		}			
		if(spanOjb.style.display=="none"){
				spanOjb.style.display="";
				imgOjb.src=img_open.src;
			}else{
				spanOjb.style.display="none";
				imgOjb.src=img_close.src;
		}
		return false;
		
	}