The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawing(s) will be provided by the Patent and Trademark Office upon request and payment of the necessary fee.

FIG. 1 is a front view of a scroll bar on a computer display screen;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof;

FIG. 4 is a front view of a fourth embodiment thereof;

FIG. 5 is a front view of a fifth embodiment thereof; and,

FIG. 6 is a front view of a sixth embodiment thereof.

FIG. 7 is a front view of a seventh embodiment thereof;

FIG. 8 is a front view of an eighth embodiment thereof; and,

FIG. 9 is a front view of a ninth embodiment thereof.

The broken line drawing of a window in all figure views is for illustrative purposes only and forms no part of the claimed design.

The broken line drawings of squares in the scroll bars in figure views 3, 4 and 8 are for illustrative purposes only and form no part of the claimed design.