Thank you! I figured it out with your help. Here is what I did:

#!/usr/bin/perl -w
use CGI::Carp qw(fatalsToBrowser);
use CGI qw(:standard :cgi-lib);
use strict;

my @modules = qw( LWP::UserAgent My::Module Crypt::Blowfish Apache::Se
+ssion::MySQL CGI CGI::Carp );
my ($_content, $mod);
foreach $mod (@modules) {
    $_content .= qq~Checking "$mod"... ~;
    eval("use $mod");
    if ($@) {
        $_content .= qq~$mod is NOT installed.~;
        $_content .= br() x 2;
    } else {
        $_content .= qq~$mod is installed.~;
        $_content .= br() x 2;
    }
}

print header(),
start_html(-title=>"System Test"),
$_content,
end_html();
[download]