private void setBombs()
	{
		int x, y;
		final Random random = new Random();
		final Tiles tiles = mField.getTiles();
		final byte bombId = tiles.getBomb().getId();
		for (int i = 0; i < mBombs; i++ )
		{
			x = random.nextInt(mWidth);
			y = random.nextInt(mHeight);
			if (mField.getTileValue(x, y).isBomb()) i-- ;
			else
			{
				mField.setTile(x, y, bombId);
				for (int tile : mField.getBorderOf(x, y))
				{
					byte tileId = mField.getTile(tile);
					mField.setTile(tile, tiles.get(tileId).getNextId());
				}
			}
		}
	}