var $j = jQuery.noConflict();

var i = 1;
var bgs = 2;

function updatebg(background) {
	clearTimeout(timer);
	i = background;
	bg();
}

function bg() {
	$j('.bg').fadeOut(1000);
	$j('#background-'+i).fadeIn(1000);
	i++;
	if(i>bgs) {
		i = 1;
	}
	
	timer = window.setTimeout(bg, 15000);
}

bg();