Hey, just thought I would let you know, that I did thinks slightly different to your suggestion and instead added the required html code to the portal.tpl file and added the scripts links under HTML includes in the control panel and it's working great.
Obviously there is an element of manual intervention each time I update an image and it's link however, this would no more than once a day anyhow.
Thanks for getting my creative thoughts into gear anyhow!
You can see how it is working here
http://www.saints247.com/ubbthreads.php
