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## step 1. take the username and password from the form
## step 2. query the mysql db and check to see whether the password  i
+s good for the username
...
                print $cgi->header(-cookie=>$cookie);
                $cookieuserid=$session->param("userid");
## now we can display anything to them because they just logged in

sub CheckIfUserIsLoggedIn
{
...
## display whatever I want to this user
}
}