Button for going to top

[demoniavbh]

I'd like to have a little button somewhere in the showthread, that allows you to automatically go to the top of the page.
For example having a little arrow in every user post's bar (where the infractions, report, show ip are...)

In another forum I'm in, it's set with a

javascript:scroll(0,0);

[SEOvB]

<a href="#top"><img src="image.gif" alt="return to top"></a>