Well, first way(image)is acceptable. OK, without referrer.
Here is some code I found, but it uses SSI. How to adjust it work with image?
#!/usr/bin/perl
#
#######################################################
# Visitor Alert Script
#
# This script notifies you by email whenever your website is visited.
#
#######################################################
print "Content-type: text/html\n\n";
$sendto = 'you@yourdomain.com';
$mailprgm = '/usr/sbin/sendmail -t';
$page = $ENV{'DOCUMENT_NAME'};
$sitename = $ENV{'SERVER_NAME'};
$client = $ENV{'HTTP_USER_AGENT'};
$camefrom = $ENV{'HTTP_REFERER'};
$addrin = $ENV{'REMOTE_ADDR'};
@ip = split (/\./, $addrin);
$binip = pack ("C4", @ip);
$isp = gethostbyaddr ($binip, 2);
{
open (MAIL, "|$mailprgm") || die 'Could not open mail program';
print MAIL "To: $sendto\n";
print MAIL "Subject: Visitor Alert\n";
print MAIL "From: Visitor Alert\n";
print MAIL "\n";
print MAIL "Visitor Alert\n\n";
print MAIL "A visitor from: $isp ($addrin)\n\n";
print MAIL "OS and browser: $client\n\n";
print MAIL "Page name: $page\n\n";
print MAIL "Referrer: $camefrom\n\n";
print MAIL "Page visited: $sitename\n\n";
close (MAIL);
}
exit;
