I think I may have found what was wrong.
I have an image as my submit button.
I changed (line 593):
I will let you know if this solves the problem.
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.