The standard HTML method
Put a link in your page where you want to go from.
<a href="#anchorName1">Go to anchor</a>
Put an anchor in your page where you want to go to
<a name="anchorName1"></a>
To return to the top of the page you simply reload the page
<a href=pageName.htm">Back to top</a>
You can have more than 1 anchor in your page simply by using another anchor name
To actually scroll to an anchor see Javascript Anchor Scroll