This the code you'd use for an Image Takeover Banner

<script type="text/javascript">
// Square Center Center
var squarecentercenter = ExpandableBanners.banner("squarecentercenter", "images/takeover.jpg");
squarecentercenter.setCloseImage("images/closebutton.jpg", 'right', 'top');
squarecentercenter.animated = true;
squarecentercenter.setDirection('center', 'center');
squarecentercenter.expandOnClick = false;
</script>

<body>
<a id="squaretopleft" href="tutorial.html"><img src="images/blank.gif" /></a>

</body>