private void start_counter()
	{
		(new Thread(){
			public void run()
			{
				ok_button.setEnabled(false);
				for(int i = 5 ; i>0;i--)
				{
					ok_button.setText(" "+i+" ");
					try {
						sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				ok_button.setText("OK");
				ok_button.setEnabled(true);
			}
		}).start();
		
		
	}