var ool = window.onload;
window.onload = function() {
  if (ool != null) ool();
  nav();
}

function nav() {
    $$('#nav > ul > li > a').each(function(elm) {
        elm.up().onmouseover = function() { this.addClassName('hover'); }
        elm.up().onmouseout = function() { this.removeClassName('hover'); }
    });
}