Comments on PHP pages

Hi, there is a page that I have created. First, let me explain how I created the page.

• I made a siteInformation.php and uploaded it into my theme-directory. The file (source) can be found here: http://nijmegen.lommers.org/public/siteInformation.phps
• In the admin-section, I choose: ‘write’, ‘write page’ and I’ve selected the corresponding ‘page template’.
• The result is a page which can be found here: http://www.lommers.org/site-information/

As you all can see, there is a comments form on the page. But, when I try to post a comment on that page, nothing happens. Have a look and try it yourself? I think the ID from the page must be filled in the page, but how?

(I did made a post similar to this one, but this is more precisely explained)

[edit]
I think I see the error. There is a line:

<input type="hidden" name="comment_post_ID" value="" />
I think the value must be filled, as on my other static pages.