im looking for a mod were it as a arrow at the bottom of posts like big threads were u click it and u go back to top thx
As far as I know there isn't any specific mod for that.
You can also simply press the home button on your keyboard to go to the top of the page.
At the bottom of every page theres "Return to top" and "Return to content".
It's a very simple template modification actually. Just find where you want to put the link (in one of the Show Thread templates) and then add the code:
<a href="#top"><img src="bigfatarrowup.gif" /></a>