var currentlyExpanded = null;
function expand(d, expandIt) {
	if (arguments.length == 1) {
		expandIt = false;
	}
	
	if (currentlyExpanded != null && currentlyExpanded != d) {
		document.getElementById("menuItem" + currentlyExpanded).style.display = "none";
	}
	
	var div = document.getElementById("menuItem" + d).style;
	if (div.display == "none" || expandIt) {
		div.display = "block";
		currentlyExpanded = d;
	} else {
		div.display = "none";
		currentlyExpanded = null;
	}
}