grid_empty_line
grid_empty_line(gd, yy, bg);
grid_empty_line(gd, lower, bg);
grid_empty_line(gd, yy, bg);
grid_empty_line(gd, yy, bg);
grid_empty_line(gd, i, 8);
void grid_empty_line(struct grid *, u_int, u_int);