Hotlinking Script for CGIProxy

I have an anti-hotlinking script for PHProxy, but I need one for my new CGIProxy. I was able to find this on Google:

  if($ENV{'HTTP_REFERER'} =~ /^http:\/\/www.443proxy.com/)
    {
    }
    else
    {
        &redirect_to('http://www.443proxy.com/', '');
    } 

Code (markup):

I am completely unfamiliar with CGI/Perl, so I do not know how this would be modified to check for more than one referrer. For instance, I want it to allow browsable.info, www.browsable.info, proxy.org, www.proxy.org, goodwaiter.com, and www.goodwaiter.com. How would this be done?

Thanks,
David