$(function() {  
// OPACITY OF BUTTON SET TO 50%  
$(".product_fade_img").css("opacity","0.5");  
// ON MOUSE OVER  
$(".product_fade_img").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: 0.5  }, "slow");  
});  
});