function navHover() {
    if(document.getElementById("kdzdrop")) {
	    navElts = document.getElementById("kdzdrop").getElementsByTagName("LI");
		for (var i=0; i<navElts.length; i++) {
			navElts[i].onmouseover=function() {
				this.className+=" navhover";
			}
			navElts[i].onmouseout=function() {
				this.className=this.className.replace(new RegExp(" navhover\\b"), "");
			}
		}
	}
}

window.onload=navHover;