var currentY = 0;
var m = window.setInterval("stripeUpdate()", 5);
var now = new Date();
var ms = now.getTime();
function stripeUpdate()
{
	now = new Date();
	var msNew = now.getTime();
	currentY += (msNew - ms) * speed;
	ms = msNew;

	if(currentY >= height){currentY -= height;}
	document.getElementById("stripe").style.backgroundPosition = "0px " + currentY + "px";
}