londrum - 11:54 am on Feb 5, 2012 (gmt 0)
cant you just change the form from POST to GET, and add a new input field with the name 'subject'
you'll have to remove the bit in the form's url where you've already put 'subject'
i think you'll have to send the message content as part of the URL as well, so you'll have to change the textarea's name to 'body'
its been a long time since i used mailto so i might be wrong
if its not online then you dont have to worry about spam