function startList() {
	if (document.all&&document.getElementById) {
		apply_mouseover_event(document.getElementById("sitenav").getElementsByTagName("LI"));

	}
}

apply_mouseover_event = function(roll_over_elements) {
  for (i = 0; i < roll_over_elements.length; i++) {
			node = roll_over_elements[i];
      if (node.nodeName=="LI") {
        node.onmouseover = function() {
          this.className+=" over";
        };
        node.onmouseout = function() {
          this.className=this.className.replace(" over", "");
        };
      }
	}
}

addLoadEvent(startList);