It's nearly 2Mb and given that my website is on Geocities, that equates to 2 views an hour

Actually it was 2.7 Mb but geocities was not keen to upload that. So if someone has got some spare bandwith I could email them the original animated gif. The new one rushes through the latter stages of the puzzle, but by then it's all just singles.
anyhoo here's the addy:
http://uk.geocities.com/aidan_001/heart.html
enjoy