function showhide(id){ 
				if (document.getElementById){ 
					obj = document.getElementById(id); 
					if (obj.style.display == "none"){ 
						obj.style.display = ""; 
						return './images/-.gif';
					} else { 
						obj.style.display = "none"; 
						return './images/+.gif';
					} 
				} 
			}