Loading site

<html>
	<head>
		... a bunch of CSS and JS files ...

		<script type="text/javascript" src="clear-load.js"></script>
	</head>
	<body>
		<div
			style="position: absolute; left: 50px; right: 50px; top: 50px; bottom: 50px; border: 3px solid black;"
			id="loading-div"
		>
			This page is loading! Be patient!
		</div>

		... Your body content ...
	</body>
</html>

document.getElementById('loading-div').style.display = 'none';