Instead of
<a href=\"onClick=\"window.open(\"/cgi-bin/site_group.pl?t_where=$website\",'Visited Sites','toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width=300,height=300')\"\">$website</a>, try
<a href='#' onClick=\"window.open('/cgi-bin/site_group.pl?t_where=$website', 'Visited Sites', 'scrollbars=yes,resizable=yes,width=300,height=300')\">$website</a>

Btw, that's still javascript. It just happens that perl is sending it out with the rest of the output to your web browser.

ALL HAIL BRAK!!!