last() problem

Hi I have the following structure on my xml document:
<GUESTBOOK>
 <POST>
  <DATE></DATE>
  <NAME></NAME>
  <EMAIL></EMAIL>
  <TEXT></TEXT>
 </POST>
</GUESTBOOK>

I present the whole thing with a xsl style sheet but now I 
want the the last position of the last child. I guess I 
could send it as an parameter from the asp page but I know 
its possible to do this within the xsl page, but how?

Please help!
Cheers,
Richard 

---------------------------
Richard Hallgren
richard.hallgren@xxxxxxx
+44 (0) 2890915132
+44 (0) 7816326858


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