You can get the alexa widget from alexa and place it in the stats page template
http://www.alexa.com/siteowners/widgets
this is the default code example:
Code:
<a href="http://www.alexa.com/siteinfo/www.visiolist.com"><script type='text/javascript' src='http://xslt.alexa.com/site_stats/js/s/a?url=visiolist.com'></script></a>
simply replace the domain with {$url} like so
Code:
<a href="http://www.alexa.com/siteinfo/{$url}"><script type='text/javascript' src='http://xslt.alexa.com/site_stats/js/s/a?url={$url}'></script></a>
Google PR is actually only for use in the Google toolbar, any other use of pagerank is a violation of TOS. That said, there are several third party services you can find out there that will do this (though most are now offline) and using the same {$url} tag as alexa to make it dynamic.
HTH