Pass department name value to message subject box?

Hi there,

I would like some help with two related issues, both using multi-department forms.


1) When the user selects a department name, I would like the department name value to be passed to the message subject input box. For example, I have a department called 'Ticket Sales'. If the user selects this department, I would like this value to be entered into the message subject box. This could be done after the form is posted, but before validation.

I also want the message subject box to be hidden so that the user cannot edit this value. This ensures that when the email appears in my local inbox, it will have the subject heading 'Ticket Sales'.


2) I also have a department called 'Everything Else'. This department will deal with everything else (clever, huh!). If the user selects this, I would like the subject message box to be visible in the normal way, so that the user can enter their own subject value.

This is presumably a simple coding issue. I am not very familiar with website coding (although I have coded just about everything else), so at the very least I need to be pointed to the file that I need to modify.

Thanks in advance for any help.