"This is the chapter 2 of the digital book Go Berserk making websites with HTML and CSS. More details available at www.go-berserk.com.
Go Berserk making websites with HTML and CSS
by Ian Simons
is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License
Based on a work at www.go-berserk.com
Permissions beyond the scope of this license may be available at www.go-berserk.com