Source code of the Groovy Web Console hosted on Google App Engine
http://groovyconsole.appspot.com

To embed one script in your site, just drop the content below where you want to embed it.

<script>
  gc_id = 1; //the script id you want to embed, you can get this in its url
  gc_width = 300; //The iframe's width
  gc_height = 100;  //The iframe's height
</script>
<script language="javascript" src="http://groovyconsole.appspot.com/js/embed.js"></script>