menuEnabled = 0;
function enableMenu() {
  menuEnabled = 1;
}
curMenu = '';
function showObject(id) {
  if(menuEnabled > 0) {
    if(curMenu) hideObject(curMenu);
    var obj = getObject(id);
    if(obj) {
      obj.style.display = 'block';
      curMenu = obj;
    }
  }
}
function hideObject(obj) {
  obj.style.display = 'none';
}
function getObject(id, oParent) {
	if(!oParent) oParent = document;
	if (oParent.getElementById) {
		elem = oParent.getElementById(id);
	} else if (oParent.layers) {
		elem = oParent.layers(id);
	} else {
		elem = oParent.all(id);
	}
	return elem;
}