Getting draggable and scrollbars to play nicely

I'm somewhat new to jQuery, so please excuse the question.
I've got a draggable dialog with a table in it - the table has
scrollbars.. Unfortunately, when you go to drag the scrollbar, you
drag the whole thing.
Now, I know about the dragPrevention property, but I can't for the
life of me figure out the syntax. (And can't find a single article on
the jQuery site that addresses it).
Any help?