How can I check if a scrollbar is visible?

Question

Is it possible to check the overflow:auto of a div?

For example:

HTML

Answer 1

I should change a little thing of what Reigel said:

(function($) {
    $.fn.hasScrollBar = function() {
        return this[0] ? this[0].scrollHeight > this.innerHeight() : false;
    }
})(jQuery);

innerHeight counts control's height and its top and bottom paddings