One thing that I noticed is that you are printing out a Location: header. I haven't tried this as a method of providing an image in an HTML document, so I can't say for sure that it will work. However, take the following code and customize it and it should work fine.

#!/usr/bin/perl -w
use strict;
use LWP::Simple;

use vars qw($in_file @imgdata @imgs 
            $num     $id      $image 
            $url     $type    $format
            $out_file);
$in_file = 'ads.dat';

@imgdata = <DATA>;

@imgs = grep {/\|(?:internal|partner)$/} @imgdata;

$num = int(rand($#imgs) +1);

($id, $image, $url, $type) = split /\|/, $imgs[$num];

$url = $url . $image;
$format = $1 if $image =~ /\.(\w+)$/;
$format = 'jpeg' if $format =~ /^jpe?g$/;

$out_file  = get($url);
print "Content-type: image/$format\n\n";
print $out_file;

__DATA__
1|/images/dibona_sm.gif|http://perlmonks.org|internal
2|/images/usermonkpics/ovidmonk.gif|http://perlmonks.org|partner
3|/pics/gol.gif|http://www.f.com|payed
[download]

The way to call it from an HTML document would be something like the following:

<img src="http://www.somedomain.com/cgi-bin/myscriptname.cgi" alt="Ran
+dom image">
[download]

The only problem that I see with it is that you can't specify the height and width tags, but being able to embed it in HTML instead of just serving an image by itself should give you greater flexibility. (This code can probably be simplified further. I just threw it together).

Cheers,
Ovid

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