for (int i = 0; i < m.height; i++)
          {
               for (int j = 0; j < m.width; j++) {
                    if(m.getCell(i,j) != null) g.drawImage(pics[m.getCell(i,j).mapNum()], j*20, i*20, this);
                    else g.drawImage(pics[0], j*20, i*20, this);
               }
          }