Okay, here it is.
I did a little video to show how it works, and some of the issues you will find.
Video: F9 Render Sequence Script
QT H.264
Script, attached.
Hope you find it useful, although I have to admit, I'm not entirely sure why you wanted this! But I like the challenge of scripting!
Also, here's a link to the Render2ImageFP plugin I mentioned, which allows you to save to the same image (32 Bit Intel only).
http://www.splotchdog.com/index.php?...d=39&Itemid=39 (Latest version)
(Thread about it, but older version attached)
http://www.newtek.com/forums/showthread.php?t=56117
Cheers
Matt
P.S. Thanks to Bob Hood for not compiling his RenderQ.ls script so I could learn from it!