YAHOO.util.Event.throwErrors = true;

function init() {
  YAHOO.util.Connect.asyncRequest('GET', css_menu_url, {success: init_callback, failure: init_failure});
}

function init_callback(o) {
  var text = o.responseText,
      linkbox = document.getElementById('LinkBox');
  linkbox.innerHTML = text;
  // Assuming an element of with ID of cssmw exists in text, for css menus
  cssmw.intializeMenu('cssmw');
}

function init_failure() {
  // nothing to do.
}

YAHOO.util.Event.onDOMReady(init);