private void fillHillDown(int xx, int yy,int side){
    	for (int ny = yy+1; ny < height; ny++){
    		if (getBlock(xx,ny) == 0 || getBlock(xx,ny) == HILL_TOP_LEFT){
    			if (side == 0){
    				setBlock(xx,ny,Level.HILL_FILL);
    			}
    			else if (side == 1){
    				setBlock(xx,ny,Level.HILL_LEFT);    				
    			}
    			else if (side == -1){
    				setBlock(xx,ny,Level.HILL_RIGHT);    				
    			}
    		}
    	}
    }