public int stringHeight(String str)
	{
		if (str == null)
			return 0;

		int height = 0;
		int length = str.length();
		for (int i = 0; i != length; ++i)
		{
			int h = charHeight(str.charAt(i));
			if (height < h)
				height = h;

		}

		return height;
	}