This is in the header:

<script>
function infopopup() {
	var win = new Window({className: "spread", title: "Ruby on Rails", top:70, left:100, width:300, height:200, url: "info.html", showEffectOptions: {duration:1.5}})
	win.show();
}
</script>

This is the span tag:

<span id="banner" onClick="infopopup()">