$(function() {  
// OPACITY OF BUTTON SET TO 50%  
$(".fadethis").css("opacity","0.7");  

// ON MOUSE OVER  
 $(".fadethis").hover(function () {  
 
 // SET OPACITY TO 100%  
 $(this).stop().animate({  
 opacity: 1.0  
 }, "slow");  
 },  
  
// ON MOUSE OUT  
 function () {  
  
// SET OPACITY BACK TO 50%  
 $(this).stop().animate({  
 opacity: 0.7  
 }, "slow");  
 });  
 });