$(document).ready(function(){			 
	//Set opacity on each span to 0%
	$(".rollover").css({'opacity':'0'});	
 
	$('div a').hover(
		function() {
			$(this).find('.rollover').stop().fadeTo(500, 0.5);
		},
		function() {
			$(this).find('.rollover').stop().fadeTo(500, 0);
		}
	)
});