use the validated entries binding for the comments form elements as the initial value.
There isn't a way to scroll to the captcha element on failed, but you can use the validation show if to add an error message near the top of the page.
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.