What you can do is use the method I explained in the previous post only include all the content you want to change in the value of the drop down menu. I.E. put all the HTML data and everything in there. You can put any type of code or whatever into the option value and have it dynamically change the content_div when the drop down menu selection changes.
There is not really a way to do this directly in the Dreamweaver functionality it needs to be custom coded.
Abraham