// this function toggles the status of a list 
function toggle(list){ 
var listElementStyle=document.getElementById(list).style; 
if (listElementStyle.display=="none"){ 
listElementStyle.display="block"; 
 }
else{ listElementStyle.display="none"; 
;
 } 
}

function closelist(list){ 
var listElementStyle=document.getElementById(list).style; 
listElementStyle.display="none"; 
}