Currently, Internet Explorer's W3C standards are closer to that than of Netscape (which will change soon with version 6 of netscape).
Example:
In IE you can color <td>'s. In Netscape you can't.
It would be best if you didn't use a program such as dreamweaver, and did as much as possible by hand. Dreamweaver may throw in some funky code netscape -or- ie might not understand.
Hope I'm right on this, and help you a bit 🙂