html hidden fields question

[chrs_d]

I'm an html coder and I want to identify from what website a user has submitted a contact form. The contact form is an <!--#include>file (.shtml) and this contact form <!--#include>file is being used on two different websites. Since it's only one file (<!--#include>) I thought about adding two hiddenfields to the <!--#include> contact form with IDs of the two different sites:

<input type="hidden" data-id="new_student_signup" name="new_student_signup" value="" />
<input type="hidden" data-id="existing_student_signup" name="existing_student_signup" value="" />

But I'm not sure this will work since it's only one file. Here's why:

• If its just one <!--#include>file, how is the form going to know what site it came from?
• Does it require a programming scripting language to get information from a hidden field in html, and if so, will my adding the two hidden input fields (with the "data-id"="" attribute) be sufficient for the html part of the <!--#include> file?
• Should I just create a new <!--#include>file for the other website and add the hiddenfield to that file?
  
  Example:
  for the hidden field "new_student_signup" <!--#include virtual="new_students/existing_student_signup.shtml>
  for the hidden field "existing_student_signup" <!--#include virtual="existing_students/new_student_signup.shtml>

Thanks

[deathshadow60]

SHTML is built SERVER SIDE--- what is sent to the client (user's browser) is flat HTML no different than if you cut/paste that file in to replace your <!--#include>

NO difference! Ok, try this. Make a page using your SHTML include... put it on your server, load it in your browser, and hit "view source".

Though for what you want to do with it -- I'd either switch to a real scripting language to change a hidden field using a variable or parameter to a function, or use multiple includes to build the form.