Re: how to get fluid layout for Dreamweaver CS5?

For Responsive Web Designs (RWD),  you can do it manually with CSS Media Queries.  David wrote a detailed tutorial below.

Introduction to CSS Media Queries

http://www.adobe.com/devnet/dreamweaver/articles/introducing-media-queries.html

Or you can jump start your RWD projects with one of these popular Frameworks.

Foundation Zurb

http://foundation.zurb.com/templates.php

Skeleton Boilerplate

http://www.getskeleton.com/

Initializr (HTML5 Boilerplate, Responsive or Bootstrap)

http://www.initializr.com/

DMX Zone's Bootstrap FREE extension for DW

http://www.dmxzone.com/go/21759/dmxzone-bootstrap/

Nancy O.