I was using the Form2Mail Hot Dreamweaver tools (HDT) as well and am replacing it with the WA Validation Toolkit. I think that you need to remove all vestiges of the HDT code for the Validation Toolkit to work. The code will be much leaner too. I am switching because I think that the HDT Captcha has been cracked by spammers. The WA one seems to be a lot more secure.