load_img();
function load_img()
		{			
			down = new Image; 
			down.src="images/down.gif";
			up = new Image;
			up.src="images/up.gif";			
		}		
function display_tr(obj,image)
		{
			if(obj.style.display == "none")	obj.style.display="";
				else obj.style.display="none";
			if(image.src == down.src) image.src = up.src;
				else image.src = down.src;
			return false;
		}