imgs = ["/images/ambulance.jpg", "/images/garage.jpg"];
var current = 0;
var last = 0;
$(document).ready(function () {
	for (var i in imgs) {
		var img = new Image();
		$(img).attr("src",imgs[i]);
		var newlayer = '<div id="layer' + i + '" style="background:url(' + imgs[i] + '); position:absolute; top:0px; width:980px; height:417px; overflow:hidden;';
		if (i>0) {
			newlayer = newlayer + ' display:none;';
		}
		newlayer = newlayer + '"></div>';
		$(".bg").html($(".bg").html() + newlayer);
	}
	changeBg(5000);
});
function changeBg(delay) {
	current ++;
	last = current - 1;
	if (current >= imgs.length) {
		current = 0;
	}
	$(".bg").animate({opacity: 1}, delay, "linear", function() {
		$("#layer"+last).fadeOut(500);
		$("#layer"+current).fadeIn(500, function() {
			changeBg(5000);
		});
	});
}