window.addEvent('domready', function(){
  $$('.small_push_off').addEvents({
    'mouseenter': function(){
      $(this).removeClass('small_push_off');
      $(this).addClass('small_push_on');
    },
    'mouseleave': function(){
      $(this).removeClass('small_push_on');
      $(this).addClass('small_push_off');
    }
  });
});