public boolean deleteByIndex(int index)
    {
    	Node curNode = head;
    	while (curNode.getDown() != null)
    		curNode = curNode.getDown();
    	
		for (int i=0; i<index ; i++)
			curNode = curNode.getRight();
		
		if (curNode == null)
			return false;
    		
		while (curNode != null)
		{
			if (curNode.getRight() != null)
			{
				curNode.getLeft().setRight(curNode.getRight());
				curNode.getRight().setLeft(curNode.getLeft());
			}
			else
			{
				curNode.getLeft().setRight(null);
			}
			curNode = curNode.getUp();
		}
		return true;
    }