var userWidth = window.screen.width;
function moveLeft() {
	var c = document.getElementById("clouds");
	var l = parseInt(c.style.left);
	var t = setTimeout("moveLeft()",15);
	l = l - 1;
	c.style.left = l + "px";
	if (l < -3000) {
		c.style.left = 0;
		clearTimeout(t);
		moveLeft();
	}
}
moveLeft();