I'm sure there are a lot of ways it could be done. I don't think there are any that would be much less complicated. You could maybe use a setTimeout() call to delay the form submit to give the message time to display.
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.