CGI issue when returning to index.html

I have a slight issue with my website. Most of the pages are generated by
Perl and they all function correctly apart from when someone logs off. When
a user clicks the logoff button, the page just goes blank instead of loading
index.html (frame page with the single frame calling /cgi-bin/main.cgi).
Refreshing the page resolves this, but is messy. The site is running on RH
8, Apache 2. The section of Perl that deals with logoffs is below.

if (param('Logout')) {
my $url = "/index.html";
print "Location: $url\n\n";
exit 0;
}

If anyone can give me any guidance I would appreciate it.