<!DOCTYPE HTML>
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								<html>
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								<head>
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								  <title>Timeline | Order groups</title>
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								  <style>
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								    body, html {
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								      font-family: arial, sans-serif;
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								      font-size: 11pt;
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								    }
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								    #visualization {
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								      box-sizing: border-box;
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								      width: 100%;
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								      height: 300px;
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								    }
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								  </style>
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								  <script src="../../dist/vis.js"></script>
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								  <link href="../../dist/vis.css" rel="stylesheet" type="text/css" />
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								</head>
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								<body>
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								<p>
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								  This example demonstrate custom ordering of groups.
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								</p>
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								<div id="visualization"></div>
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								<script>
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								  var groups = new vis.DataSet([
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								    {id: 0, content: 'First', value: 1},
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								    {id: 1, content: 'Third', value: 3},
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								    {id: 2, content: 'Second', value: 2}
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								  ]);
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								  // create a dataset with items
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								  // note that months are zero-based in the JavaScript Date object, so month 3 is April
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								  var items = new vis.DataSet([
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								    {id: 0, group: 0, content: 'item 0', start: new Date(2014, 3, 17), end: new Date(2014, 3, 21)},
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								    {id: 1, group: 0, content: 'item 1', start: new Date(2014, 3, 19), end: new Date(2014, 3, 20)},
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								    {id: 2, group: 1, content: 'item 2', start: new Date(2014, 3, 16), end: new Date(2014, 3, 24)},
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								    {id: 3, group: 1, content: 'item 3', start: new Date(2014, 3, 23), end: new Date(2014, 3, 24)},
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								    {id: 4, group: 1, content: 'item 4', start: new Date(2014, 3, 22), end: new Date(2014, 3, 26)},
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								    {id: 5, group: 2, content: 'item 5', start: new Date(2014, 3, 24), end: new Date(2014, 3, 27)}
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								  ]);
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								  // create visualization
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								  var container = document.getElementById('visualization');
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								  var options = {
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								    // option groupOrder can be a property name or a sort function
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								    // the sort function must compare two groups and return a value
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								    //     > 0 when a > b
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								    //     < 0 when a < b
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								    //       0 when a == b
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								    groupOrder: function (a, b) {
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								      return a.value - b.value;
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								    },
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								    editable: true
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								  };
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								  var timeline = new vis.Timeline(container);
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								  timeline.setOptions(options);
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								  timeline.setGroups(groups);
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								  timeline.setItems(items);
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								</script>
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								</body>
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								</html>
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