var d = document;
	var count = 1;
	
	function changeBG() {
		d.getElementById('hdr').style.backgroundImage = 'url(img/' + count + '.jpg)';
		if (count < 5) {
			setTimeout('changeBG(count)',5000);
		} else {
			count = 1;
			changeBG(count);
		}
		count++;
	}