Pass subject from link to contact form?

Hi, does anyone know how to pass the subject from a link to the contact form page that it links to? Thanks, I appreciate your help.

 

I want to be able to link to contact.php (the page that has the form on it), and have the subject field passed from the link that they clicked to get there.

 

perhaps a querystring?

say your link was contactus?subject=Requesting Something

from the contact.php page in the form input field set the value as <?= $_GET['subject'] ?>

or something like that rather

 

That worked great, thanks!