Hi,
I wouldn't recommend using the "mailto" type of form, its very hit & miss fo it working.
Totally relies on the visitor having an email proggy installed & configured in the browser, and they also have to send the message, after getting some security warnings!
It also does not work with AOL (big loss!!!!!) and some other email systems, it completely flids out the one we use ar work.
You are much better off useing something like
http://www.response-o-matic.com/ I've used them on websites I've done, very simple to use, not much more than changing the action tag on a form.