If you are referring to clicking on a particular topic in the forum index you can go directly to the last post in the thread by clicking the white page icon next to the name of the last guy to post way over on the right side of the screen in the column labeled Last Post.
If you click "View posts since last visit" at the top of any page or at the top of the right hand column on the home page, you can go the newest post in a thread (if there are any) by clicking the gold colored page icon at the left of the page by the topic title.
I hope the answer to your question is in there somewhere! I am not sure what you mean by "reset at the bottom".