(function(){
	
	var	bg1X = 0;
	var	bg2X = 0;
	var	bg3X = 0;

	function bgScroll(){
		bg1X += -1;
		bg2X += -3;
		bg3X += -6;

		document.getElementById("frame").style.backgroundPosition = bg1X + "px " + bg2X + "px" ;
		document.getElementById("subFrame").style.backgroundPosition = bg1X + "px " + bg3X + "px" ;
	}

	window.onscroll = bgScroll;

}
)();