How to count posts in showthread - how many are displayed on a page?

[R1D1]

hi!

does anybody give me a hint, how to count the posts, that are displayed on an individual showthread-page?

for example:

thread "blabla" has 3 pages.

page one: 15 posts
page two: 15 posts
page three: 5 posts

how can i get the numbers in a template (15, 15, 5?)

i want to show a left sidebar, an its length should respond to the number of posts on the page.

any ideas?

thanks a lot :)

anybody? :(