$(document).ready(function(){  
   
    //When mouse rolls over  
$("li").mouseover(function(){  
$(this).stop().animate({height:'150px'},{queue:false, duration:600, easing: 'easeOutBounce'})  
});  
    //When mouse is removed  
$("li").mouseout(function(){  
$(this).stop().animate({height:'50px'},{queue:false, duration:600, easing: 'easeOutBounce'})  
});  
   
});