new Thread()
    {
      public void run()
      {
        int R,redL,redR,redU,redD;
        int G,greenL,greenR,greenU,greenD;
        int B,blueL,blueR,blueU,blueD;
        double probability;
        int delay;
        Thread thread = new Thread();
        {
        while(true){
          synchronized(board)
          {
            try
            {
              for( int y = 0; y < hei; y++ )
              {
                for( int x = 0; x < wid; x++ )
                {
                  delay = (int) ( ( random.nextDouble() + 0.5 ) * k );
                  probability = random.nextDouble();

                  if(probability <= p) //random color
                  {
                    board[x][y].setBackground( new Color( random.nextInt(256),
                                                            random.nextInt(256),
                                                            random.nextInt(256) ));
                  }
                  else //neighbors color
                  {
                    try{ redL = ((board[x-1][y].getBackground()).getRed()); } catch( ArrayIndexOutOfBoundsException e ) { redL = 0; }
                    try{ redR = ((board[x+1][y].getBackground()).getRed()); } catch( ArrayIndexOutOfBoundsException e ) { redR = 0; }
                    try{ redU = ((board[x][y+1].getBackground()).getRed()); } catch( ArrayIndexOutOfBoundsException e ) { redU = 0; }
                    try{ redD = ((board[x][y-1].getBackground()).getRed()); } catch( ArrayIndexOutOfBoundsException e ) { redD = 0; }

                    R = (int) ( (redL + redR + redU + redD) / 4 );

                    try{ greenL = ((board[x-1][y].getBackground()).getGreen()); } catch( ArrayIndexOutOfBoundsException e ) { greenL = 0; }
                    try{ greenR = ((board[x+1][y].getBackground()).getGreen()); } catch( ArrayIndexOutOfBoundsException e ) { greenR = 0; }
                    try{ greenU = ((board[x][y+1].getBackground()).getGreen()); } catch( ArrayIndexOutOfBoundsException e ) { greenU = 0; }
                    try{ greenD = ((board[x][y-1].getBackground()).getGreen()); } catch( ArrayIndexOutOfBoundsException e ) { greenD = 0; }

                    G = (int) ( (greenL + greenR + greenU + greenD) / 4 );

                    try{ blueL = ((board[x-1][y].getBackground()).getBlue()); } catch( ArrayIndexOutOfBoundsException e ) { blueL = 0; }
                    try{ blueR = ((board[x+1][y].getBackground()).getBlue()); } catch( ArrayIndexOutOfBoundsException e ) { blueR = 0; }
                    try{ blueU = ((board[x][y+1].getBackground()).getBlue()); } catch( ArrayIndexOutOfBoundsException e ) { blueU = 0; }
                    try{ blueD = ((board[x][y-1].getBackground()).getBlue()); } catch( ArrayIndexOutOfBoundsException e ) { blueD = 0; }

                    B = (int) ( (blueL + blueR + blueU + blueD) / 4 );

                    board[x][y].setBackground( new Color(R,G,B) );
                  }
                  sleep(delay);
                }
              }
            } catch( InterruptedException e ){};
            Thread.yield();
          }
        }
        }thread.start();
      }
    }.start();