var ul;
function rollover() {
	if(document.getElementById && document.getElementsByTagName) {
		var li = document.getElementById("management");
		ul = li.getElementsByTagName("ul");
		if(ul.length > 0) {
			ul = ul[0];
			li.onmouseover = function() {
				ul.style.display = "block";
			};
			li.onmouseout = function() {
				ul.style.display = "none";
			};
		}
	}
}

window.onload = rollover;