Scroll to Top plugin’s for WordPress

[1] — good, installed this one, works great!
jQuery Smooth Scroll 1.2.4

[2] — good, but not updated for 2 years now
Cudazi Scroll to Top

Version: 0.1 Adds a smooth scroll to top feature/link in the lower-right corner of long pages.

http://wordpress.org/plugins/cudazi-scroll-to-top/

NOTE:
After installing and activating this plugin, view code you will see:
link rel=’stylesheet’ id=’blogsynthesis-scroll-to-top-style-css’ …