window.addEvent('domready', function() {
  var list = $$('ul.menu-vert li a');
  list.each(function(element) {
    element.set({
      'styles': {
        'margin-left': 0
      }
    });
    var fx = new Fx.Styles(element, {duration:500, wait:false});
    element.addEvent('mouseenter', function() {
      fx.start({
        'margin-left': 5
      });
    });
    element.addEvent('mouseleave', function() {
      fx.start({
        'margin-left': 0
      });
    });
  });
});