DW form problem

Hey all,
What I need to do is set up a form so that all the user has to do is type in their email address and when they submit that in a form, they are added to a mailing list.

http://www.thesmoothpursuit.com/index2.htm is the page that has the form on it so far.

So I set things in up DW and assumed that things are all and well, but when I try to test things out, my default mail program opens up to send the form, which is not what I want.

I am just using the default form buttons within DW, to insert fields and the submit button. "mailto:[email protected]" is the action and the method is POST. Should I be using “GET”? Is there some kind of PHP or other page I need to do first, something for the form to point to?

Any help would be greatly appreciated.

Thanks much.