I use an ISDN script in my Ebay store - the ISDN script is derived from the Dynamic Drive script mentioned in the first post but has been tweaked.
http://stores.ebay.com.au/Oz-Quilts_W0QQssPageNameZl2QQtZkm
I have several customised Sliders running across different categories on Ebay.
If you want to play with this code you could create an ISDN script and pick out any enhancements you want to create a customised look to your script.
http://www.isdntek.com/tagbot/xsell.htm
Hope this helps someone