When applying a style to a table is it better to do it as a table id or just use class. Want to have different style tables so dont want to redefine the table tag. Do id's need to be unique when on the same page.

I am using Dreamweaver studio 8 and on the drop down you can only choose an id once on that page. Can duplicate the id if I use code though. I know most people just use divs but I am still not confident enough to utilise the benefits yet. There seem to be cross brower pitfalls and layout problems particularly with Dreamweaver.

Any advice, yes please!!