Entry number different in write a comment view

If I click on "write a comment" on any entry, the entry number is different in the wirte a comment view. For example, if I click to write a comment on entry 417 the entry number chnages to 14701 in the write a comment window. Any thoughts?

You can view the guestbook here:
http://www.marcellusny.com/guestbook/index.php

Also, after someone writes a comment they are directed to the top of the guestbook. How could I have them directed to the entry they wrote the comment for?

Also, also, is there a way to recieve a notification email when someone writes a comment, as opposed to just when they add a new entry?

Thanks guys.

The number in the add comment window is the real number of the entry. Not a lot we can do about it (well not a lot I can do since this isn't my work) but it does not affect the guestbook in anyway.