Link to a form with a pre-filled subject line?

[Morgan19]

A client of mine has a regular Contact Us form on her site. She's asking if it's possible to have a link elsewhere on the site that, when clicked, goes to the form and has a subject field pre-filled in. The caveat is that this form still needs to exist as a generic Contact Us form when a user navigates to it directly, so I can't just have the subject line exist in the form already: the link has to go to the form page and fill in the field somehow.

Is something like that possible? I know you can create subject-filled mailto links using the ?subject= code, but've never tried to do it with a link to a form and can't think how it might be done. The simpler the better as the site is just .shtml, nothing fancy.

Thanks,
m19

[drhowarddrfine]

This must be done using server side programming. HTML/CSS cannot do this.