function toggle(list) { 
var elem=document.getElementById(list); 
if (elem.style.display=="none"){ 
elem.style.display="block"; 
 }
else{ 
elem.style.display="none"; 
 } 
}

function collapse(prefix, totalnumber) {
for (i=1;i<=totalnumber;i++) {
	document.getElementById([prefix+i]).style.display="none";
}
}