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tapis.js

javascript: (function() {
	var docBody = document.body,
		pNode = docBody.parentNode,
		node = docBody.cloneNode(true);
	pNode.appendChild(node);
	pNode.style.overflow = 'hidden';
	styles = node.style;
	styles.width = '100%';
	styles.position = 'absolute';
	styles.top = 0;
	styles.opacity = 0.5;
	styles.filter = 'alpha(opacity=50)';
	setInterval(function() {
		var top = styles.top,
			left = styles.left,
			newTop = top.substring(0, top.length - 2) * 1 + Math.ceil(Math.random() * 3) - 2,
			newLeft = left.substring(0, left.length - 2) * 1 + Math.ceil(Math.random() * 3) - 2,
			newTop = (newTop > 5) ? 4 : newTop,
			newTop = (newTop < -5) ? -4 : newTop,
			newLeft = (newLeft > 5) ? 4 : newLeft,
			newLeft = (newLeft < -5) ? -4 : newLeft;
		styles.top = newTop + 'px';
		styles.left = newLeft + 'px';
	}, 10);
})();