{
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      "values": [
        3,
        8,
        2,
        {
          "top": 7
        },
        {
          "top": 3,
          "colour": "#000000",
          "tip": "BLACK BAR<br>#top#"
        },
        null,
        5
      ],
      "tip": "Blue bar<br>Value:#val#"
    },
    {
      "type": "bar",
      "values": [
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        4,
        1,
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      "colour": "#FFEF3F",
      "tip": "Yello bar<br>Value:#val#"
    }
  ],
  "title": {
    "text": "Tue May 22 2012"
  },
  "bg_colour": "#FFFFFF"
}