$(function() {
	$(".tariffe[rel], .casa[rel]").overlay({
	
	effect: 'apple',
	mask: { 
 
        // you might also consider a "transparent" color for the mask 
        color: '#000', 
 
        // load mask a little faster 
        loadSpeed: 200, 
 
        // highly transparent 
        opacity: 0.5 
    }
	
	});
});