You could probably update to CSS by stripping out the <table> tags with find & replace.
From Tables to CSS Web Design Part 1 -
From Tables to CSS Web Design Part 2 -
But CS4 has many new features that DW8 didn't have. This might be a good opportunity to learn to use CS4 and change the whole look of your site.
Creating your first website in DW CS4 -
hi nancy. thanks a lot for that link. it's a very helpful tutorial. i think i'll start from scratch and learn it that way. seems less risky and more beneficial.