DHTML and accessibility

Hello:

My question is: how does a reader read a submenu that's triggered from
JavaScript and is located on another layer?

This also brings me to the following question: are layers readable by a
screen reader.  I use Dreamweaver and use a lot of layers but I don't
convert them to tables.
W3C discourages the use of tables and favors instead the positioning of
elements with CSS.

I'm getting ready to redesign our site completely (Yippee!!!). I have a plan
to have a PLAN, instead of cleaning up later. (-:

Thanks for your thoughts and comments,

Dominique

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