As of Dreamweaver is being a great tool for Web Site Building, and already as a no. of option one required to build a complete website, i being using CS3 and its really working excellent.
Hi!
As of your right sidebar
#sidebar should not contain position:relative; and alwys note that right align/floating div should be mention/wrote before left align/floating div.
Eg: <div id="sidebar"> .... </div> should be mention before <div id="contenthome">... </div> to get align properly...