s_img = new Array();
  		s_img[0] = new Image; s_img[0].src = "/i/bb_floor.gif";
  		s_img[1] = new Image; s_img[1].src = "/i/b_floor.gif";
        s_img[2] = new Image; s_img[2].src = "/i/bb_shop.gif";
  		s_img[3] = new Image; s_img[3].src = "/i/b_shop.gif";
  		s_img[4] = new Image; s_img[4].src = "/i/bb_event.gif";
  		s_img[5] = new Image; s_img[5].src = "/i/b_event.gif";
        s_img[6] = new Image; s_img[6].src = "/i/bb_info.gif";
  		s_img[7] = new Image; s_img[7].src = "/i/b_info.gif";
        s_img[8] = new Image; s_img[8].src = "/i/bb_top.gif";
  		s_img[9] = new Image; s_img[9].src = "/i/b_top.gif";
       function mouseOn(n){
               document.images["button"+n].src = s_img[2*n-2].src;
       }
       function mouseOff(n){
               document.images["button"+n].src = s_img[2*n-1].src;
}