The Website IHateNetscape.com has just released an article regarding the issue of Macromedia not following web standards and therefore making it hard for non Microsoft browsers to survive.
An official statement in the article from Macromedia states:
...Macromedia recognizes developers may target browsers in common usage that cannot interpret or take advantage of the latest specifications...
The Article also does its own test with a demo site to prove that Macromedia Dreamweaver software does not in fact follow the W3C standards which in the end result means IE specific code and no support for Netscape or other browsers.