Is it possible to scroll 2 scrollbars with one scrollbar?
All you need to do it tie the scrollTop property of one element to the scrollTop of the other, using a function tied to the scroll event.
Something along the lines of:
$('.linked').scroll(function(){
$('.linked').scrollTop($(this).scrollTop());
})
With that function, all elements with a class of linked will scroll whenever you use the scrollbars of one of them. (I assumed vertical scrolling, if you wanted horizontal, do the same but with scrollLeft)
See http://jsfiddle.net/g8Krz/510/ for a working example of the above.