function makeHovers(navRoot)
{
    for (i=0; i < navRoot.childNodes.length; i++){
        node = navRoot.childNodes[i];
        if (node.nodeName == "LI") {
            YAHOO.util.Event.addListener(node, "mouseover", function() { 
				clearMenu(navRoot);											 
				this.className = "c";
			});
        }
    }
}

function clearMenu(navRoot)
{
    for (i=0; i < navRoot.childNodes.length; i++){
        node = navRoot.childNodes[i];
        if (node.nodeName == "LI") {
            node.className = "";
        }
    }
}

YAHOO.util.Event.addListener(window, "load", function() { makeHovers(document.getElementById("mm")); });