The ornamental design for a bedheadboard, as shown and described.
FIG. 1 is a front perspective view of a bed headboard according to a first embodiment;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof; and
FIG. 4 is a right side view thereof.
FIG. 5 is a front perspective view of a bed headboard design according to a second embodiment, the design having a width less than that of the first embodiment; and
FIG. 6 is a front view thereof, it being understood that the left and right side views are identical to those of the first embodiment.
FIG. 7 is a front perspective view of a bed headboard design according to a third embodiment, the design having a width less than that of the second embodiment; and,
FIG. 8 is a front view thereof, it being understood that the left and right side views are identical to those of the first embodiment.
The rear and bottom of the bed headboard form no part of the claimed design.