How do I dynamically change the content in an iframe using jquery?

I was wondering if it is possible to have a site with an iframe and some jquery code that changes the iframe content every 30 seconds. The content is in different webpages.

Something like this:

<html>
  <head>
    <script type="text/javascript" src="jquery.js"></script>
    <script>
      $(document).ready(function(){
        var array = new array();
        array[0] = 'http://webPage1.com';
        array[1] = 'http://webPage2.com';
        // And so on.
        // Do something here to change the iframe every 30 second
      });
    </script>
  </head>
  <body>
    <iframe id="frame"></iframe>
  </body>
</html>