dom = (document.getElementById)? true : false;
ie4 = (document.all && !dom)? true : false;
function menuClick(elemId) {
if (dom || ie4) {
var currElement = (dom)? document.getElementById(elemId) : document.all[elemId];
currElement.style.display = (currElement.style.display == 'none')? 'block' : 'none';
return false;
} else return true;
}