startList = function() {
if (document.all&&document.getElementById) {
		navRoot = document.getElementById("nav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				var exposed = 0
				for (c=0; c<node.childNodes.length; c++) {
					child = node.childNodes[c]
					if (child.className == 'exposed_set') {
						exposed = 1
					}
				}
				if (!exposed) {
					node.onmouseover=function() {
							this.className+=" over";
					}
					node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
					}
				}
			}
		}
	}
}
window.onload=startList;

function toggle_element(target) {
	// switch element visibility
	if (document.getElementById(target).style.display == 'none') { 
		document.getElementById(target).style.display = 'block'
	}
	else { 
		document.getElementById(target).style.display = 'none'
	}
}