$(document).ready(function(){  
  
    //When mouse rolls over  
    $(".menu").mouseover(function(){  
        $(this).stop().animate({width:'160px'},{queue:false, duration:600, easing: 'easeOutExpo'})  
    });  
  
    //When mouse is removed  
    $(".menu").mouseout(function(){  
        $(this).stop().animate({width:'138px'},{queue:false, duration:600, easing: 'easeOutBounce'})  
    });  
  
});