You could use jQuery to accomplish this, which would have the cool scroll rather than it just popping up. Have you're main content in a div, then the content you want to show in a hidden div, like:
<div>Main Content</div>
<div id="hiddenLab" style="display:none">Content to show</div>
You would then use the jQuery slideToggle command to slide it up and down, something like:
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(function() {
$("#hidden").click(function(){
$("#about").slideToggle("slow");
});
});
</script>
<style type="text/css">
#maincontent { width:100%; height:100px;background:green}
#about { width:100%; height:1000px;display:none;background:red;}
</style>
</head>
<body>
<div id="maincontent">
<a id="hidden" href="#">Click to see hidden</a>
</div>
<div id="about">Content to show</div>
</body>