// JavaScript Document

// this function toggles the status of a list 
function toggle(image,list){ 
var listElementStyle=document.getElementById(list).style; 
if (listElementStyle.display=="block"){ 
listElementStyle.display="none"; 
document.getElementById(image).src="/icon/cross_icon.png"; 
document.getElementById(image).alt="Close list"; }
else{ listElementStyle.display="block"; 
document.getElementById(image).src="/icon/dash_icon.png"; 
document.getElementById(image).alt="Open list";
 } 
}