= {
    dataAxis: {showMinorLabels: false},
    start: '2014-06-09',
    end: '2014-07-03'
  };
  var graph2d = new vis.Graph2d(container, items, groups, options);


  /**
   * this function fills the external legend with content using the getLegend() function.
   */
  function populateExternalLegend() {
    var groupsData = groups.get();
    var legendDiv = document.getElementById("Legend");
    legendDiv.innerHTML = "";

    // get for all groups:
    for (var i = 0; i < groupsData.length; i++) {
      //