The ornamental design for an overbedtabletop, as shown and described.
FIG. 1 is a front, top, left side isometric view of an overbed table top in accordance with my design;
FIG. 2 is a front elevation view of the overbed table top of FIG. 1, (the rear elevation view is identical to the front elevation view);
FIG. 3 is a left side elevation view of the overbed table top of FIG. 1, (the right side elevation view is identical to the left side elevation view);
FIG. 4 is a top plan view of the overbed table top of FIG. 1;
FIG. 5 is a bottom plan view of the overbed table top of FIG. 1; and,
FIG. 6 is a cross-section taken along line 6-6 of FIG. 4, where the cross-section is enlarged relative to FIGS. 2 and 3 so that a depth of a recess defined by the overbed table top is more clearly seen.