In CSS Sculptor under the 'Layout' tab under 'Page Structure', you would simply set the page width to 100%. Under the 'Box' tab, you could then set the column and content widths as you like - as % of full width, or set exact widths.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.