$(document).ready(function(){

    //When mouse rolls over
    $(".bottoni a").mouseover(function(){
        $("div", this).stop().animate({height:'50px'},{queue:false, duration:600, easing: 'easeOutBounce'})
    });

    //When mouse is removed
    $(".bottoni a").mouseout(function(){
        $("div", this).stop().animate({height:'0px'},{queue:false, duration:600, easing: 'easeOutBounce'})
    });

});