The attachment, is a PHP-script, that just randomly selects an image, and views it. I use it too, for my avatar
The script doesn't encode it, into it's own, due to the need of 30% of more space, like WDZ said before
It works with .jpg and it's not been tested with .png or .gif
Enjoy!
[edit]
Maybe your script doesn't work, due to the Lycos banner...
Oh and The PHP-support at Lycos sucks (at least for Lycos Netherlands...)
Maybe you can put the script on some webspace of your provider...