This the code you'd use for the top-left banner

<script type="text/javascript">
// Corner Page Peel
var squaretopleft = ExpandableBanners.banner("squaretopleft", "images/cornerpeel-big.png");
squaretopleft.animated = true;
squaretopleft.setDirection('down', 'left');
squaretopleft.expandOnClick = false;
</script>

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

</body>