Well I thought I had figured it out...

I used FTP to download the LotImgxxx.jpg pictures from the Auction lots with the supersized pictures. I used PLiska to batch resize them to the size I wanted keeping the file names the same. I then uploaded the LotImgxxx.jpg files back to my AW2K folder on my web server overwriting the old files. I went back on eBay and viewed the listings only to find that the lower quality resolution images were being streatched to the same dimensions as the previous images with the final result looking very bad. Ut Oh... What now?