This the code you'd use for the Flash Banner

<script type="text/javascript">
// Square Top Left
var squaretopleft = ExpandableBanners.banner("squaretopleft", "images/square_expanded.jpg");
squaretopleft.setCloseImage("images/closebutton.jpg", 'left', 'top');
squaretopleft.animated = true;
squaretopleft.setDirection('up', 'left');
squaretopleft.expandOnClick = true;
</script>

<body>

<a id="squaretopleft" href="www.yourwebsite.com"><img src="images/square.jpg" /></a>

</body>