You need to look into Panels and Lite-C / C-Script...

Code:

---

PANEL new_game_pan
{
	pos_x = 0; pos_y = 0;
        bmap = bg_bmap;
   
   button = 5,0,new_game_bmp,new_game_bmp,new_game_on_bmp,New_Game,NULL,NULL;
   button = 15,32,load_game_bmp,load_game_bmp,load_game_on_bmp,Load_Game,NULL,NULL;
   button = 25,64,quit_game_bmp,quit_game_bmp,quit_game_on_bmp,Quit_Game,NULL,NULL;

   layer = 1;
  
   flags = OVERLAY | TRANSLUCENT;
}

  

---