With the latest version of Digital File Pro that is within Universal Email you can have a single file field and set it up to upload the regular full size image and create a thumbnail at the same time.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.