Javascript, and a lot of it. On the page:
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Welcome to Steam</title>
<link href="http://cdn.store.steampowered.com/public/css/styles_storev5.css?v=221260115" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/swfobject.js?v=3216748271&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/prototype-1.6.0.2.js?v=1627908004&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/scriptaculous/scriptaculous.js?v=1333279996&l=english&load=effects,controls,slider"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/javascript.js?v=853265233&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/main.js?v=199395227&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/jserrorreport.js?v=19341832&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/header.js?v=318945778&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/search.js?v=630051104&l=english"></script>
<script type="text/javascript" src="http://cdn.store.steampowered.com/public/javascript/cluster.js?v=4033443305&l=english"></script>
<link rel="search" type="application/opensearchdescription+xml" title="Steam Search" href="http://store.steampowered.com/public/open_search.xml">
</head>
Known libraries: Scriptaculous. Prototype. swfobject.js! It is strange that the last one should really be useful for embedding flash memory, although I'm not sure that it is used on this page (perhaps only elsewhere on the site for movies or audio).
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