Hi, this is Eliza.I think you should for the 5th edition.It is available by march 2010.It includes the following.the book is called Web design and design foundation with XHTML by Terry Felke-morris.
Expanded coverage of CSS
Expanded coverage of accessibility
Expanded coverage of design topics
Updated code samples and web resources
New section on Domain Name Selection
New section on Styling for the Mobile web
I am also sharing some web designing
tips with you.