script to resize tidypics icons?

does anyone have a script that will iterate through the full list of tidypics images and regenerate the thumbnails for them from the master image?
if we change the size of the thumbnails via the tidypics admin panel there is presently going to be a mish mash of image sizes rendered in the browser, since those that were created before the change of icon dimensions will be a different size to those that were created after the size change.

i have created similar scripts for videolist and other plugins - though i am just wondering if anyone already has one for tidypics?
thanks