Here is one of the way to disable right-click by
using Dreamweaver's Extension file from Macromedia.com.
Download this file
and save it in ur Dreamweaver directory (*ie : C:\Program Files\
Macromedia \ Dreamweaver 4\Downloaded Extensions*). To install this
extension, you should have an Extension Managers (from
Macromedia Exchange) installed in ur computer, click here
to download the extension manager.
How to use it ? Once you were done with the installation, go to Insert > No Right Click. As easy as 1-2-3...isn't it ? BUT BUT BUT...if you want to modify the popup-window-msg, you have to edit it in HTML code view. Still a lot easier, than copy paste from another page that you had before.
Demo : right+click this page, and you will see the msg. You can insert it in <body> tag also.
Enjoy it 
Try your best
to view the source...hehehe 