$(document).ready(function(){   
  
    //When mouse rolls over   
    $(".top_button").mouseover(function(){
		//alert("!");
        $(this).children().stop().animate({height:'50px'},'fast');   
    });    
    //When mouse is removed   
    $(".top_button").mouseout(function(){   
        $(this).children().stop().animate({height:'40px'},'fast');   
    });   
  
});