DHTML, Javascript, Zencart, Flash

We have an existing? zencart based website. We need [login to view URL]'s tshirt customization functionality to be developed in DHTML and Javascript and integrated with our shopping cart? end to end (right from customization to placing an order to chkout) <[login to view URL]> We need all the features they have for tshirt customization, in the identical flow of selecting, tshirt, models, views etc etc The quality should be same if not better than zazzle.? Please send in links to this kind of work done before (in DHTML and javascript only) -- After many inputs, we are now open to doing this in Flash as well. So again, this project would include 1. Zazzle tshirt customization module to be developed 2. Integration of this module end to end with my zencart website. Right from customization, saving customized product into DB, placing an order for it, and checking out. (note shopping cart is working completely, so only needs to be integrated with this module) We are using Zen Cart 1.3.8a Database Patch Level: 1.3.8 PHP version 5.2.6 MYSQL 5.0 Please note that I have modified this for it to be done in Flash as well. We are open to it, please send in links to this kind of work done before and your suggestion on the technology to be used - Flash or DHTML Thanks