アクセス毎に背景色を変化

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<script type="text/javascript">
<!--
function cngBg(){
	myDate = new Date();
	var s  = myDate.getSeconds();
	var t  = (s - 7 * (Math.floor( s / 7 )));
	switch (t){
	case 0 :document.bgColor = '#ff4444';
		break;
	case 1 :document.bgColor = '#ff9d88';
		break;
	case 2 :document.bgColor = '#f2ff88';
		break;
	case 3 :document.bgColor = '#88ff21';
		break;
	case 4 :document.bgColor = '#66eaff';
		break;
	case 5 :document.bgColor = '#6648ff';
		break;
	case 6 :document.bgColor = '#ff88ff';
		break;
	}
}
window.onLoad = cngBg();
//-->
</script>
</head>
<body>

</body>
</html>