$(function(){ 
  $('ul.second_level a')
    .css( {backgroundPosition: "-20px 35px"} )
    .mouseover(function(){
     $(this).stop().animate({backgroundPosition:"(-20px 94px)"}, {duration:500})
    })
  .mouseout(function(){
    $(this).stop().animate({backgroundPosition:"(40px 35px)"}, {duration:200, complete:function(){
      $(this).css({backgroundPosition: "-20px 35px"})
    }})
  })
});