Top of the Page Pro
"Return to Top" links do nothing for SEO and can even detract from it, and they can clutter your page. When you have a very long page, how do you decide where to put them? Do you need more than one? Are they visible when the user is already at the top of the page?
Top of the Page removes these concerns by creating a "Return to Top" link when the page has been scrolled by a certain (configurable) designated distance. When the page is scrolled back to the top (above the configured distance), the link disappears. If your page is short and users can't scroll down, the link will never be visible.
Your button can be text or images and as of version 2.0, can include an icon using your own icon-fonts - stylable in the plugin configuration, so you're not limited to any included images. The text is set using standard Joomla translation files, and can be overridden using the Joomla Language Manager (instructions included).