var obje;
function scroll_bg_image(obj, to, current, movement, delay) {
	obje = obj;
	if((movement > 0 && current < to) ||
			(movement < 0 && current > to)) {
		obj.style.backgroundPosition = "0px "+(current+movement)+"px";
		setTimeout("scroll_bg_image(obje, "+to+", "+(current+movement)+", "+movement+", "+delay+")", delay);
	}
}