ScrollTop is a Joomla system plugin which add automatic 'Back to Top' link when the page has scrolled to a specified point.
*Simple & easy to use, all you have to do is to enable the pluin.
*Add "Back to Top" to all site pages.
*The plugin is SEO, it no need add any html code to the page.
*Tested on IE, Firefox, Chrome, Safari, Opera etc.
*Lightweights, less than 1kb.