Forum Moderators: open
A script cannot submit a form (using the submit() method of the Form object, for instance) to a mailto: or news: URL without the UniversalSendMail privilege or the user's explicit approval through a confirmation dialog. Such a form submission would contain the user's email address, which should not be made public without the user's permission.
In short, you're opening up a bag of complication by sending email with JavaScript. How about a simple CGI sendmail script? It's more univeral than JavaScript, and there are a host of good free scripts around.