$(document).ready(function() { 

	rnd.today=new Date();
	rnd.seed=rnd.today.getTime();
	
	function rnd() {
			rnd.seed = (rnd.seed*9301+49297) % 233280;
			return rnd.seed/(233280.0);
	};

	function rand(number) {
			return Math.ceil(rnd()*number);
	};
	var imgNum = rand(4);
	var photo = "/default/includes/themes/bbp/images/home-banner-" + imgNum + ".jpg";
	$('img.banner').attr("src", photo);
});