var collapse = '';
function display(elementID) {
var ID = "item" + elementID;
if (collapse == '') {
	document.getElementById(ID).style.display = "";
	collapse = ID;
  }
else {
	if (collapse == ID) {
		document.getElementById(collapse).style.display = "none";
		collapse = '';
	  }
	else {
		document.getElementById(collapse).style.display = "none";
		document.getElementById(ID).style.display = "";
		collapse = ID;
	  }
  }
}