I was able to incorporate my own JavaScript within FrontPage, the only trick is that you cannot have any of the other form fields set to use FrontPage validation. What I did was set all the fields to use FrontPage validation, saved the page and then I cut all the validation code out and placed it into Notepad. Then, I went back and took out all of the validation rules using FP in "normal" view. So now I had a form without any FP validation and I had the code that Front Page would normally use for validation saved in Notepad. Then I added the new form field validation code that I needed to the code that I had saved in Notepad (in this case it was code to validate an email address). Then, I copy and pasted the code I had in Notepad back into FrontPage using "HTML View" and named my new funtion:function VerifyForm(Registration)
and then I added this to the <form> tag:
onsubmit="return VerifyForm(this)"
So basically this kind of tricks FrontPage into thinking you aren't using it's own validation when in fact you are using the same validation script it normally uses plus whatever you add to it.
Whatever you do, DO NOT go back into the form again and use FrontPage's validation because you it will bypass this newly created function.