Are you getting any JavaScript errors? If you can, I would use Firebug extension in Firefox to report back what the errors are. Do you know if the original image filename has any weird characters in it?
-justin
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.