Highcharts test tool

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>

<div id="container" style="height: 300px"></div>

JavaScript

var chart = new Highcharts.Chart({

    chart: {
        renderTo: 'container'
    },

    xAxis: {
        type: 'datetime'
    },

    series: [{
        data: [39.9, 81.5, 116.4, null, 154.0, 186.0, 145.6, 158.5, 226.4, 204.1, 105.6, 64.4],
        pointStart: Date.UTC(2012, 0, 1),
        pointInterval: 24 * 36e5,
        connectNulls: true
    }, {
        data: [29.9, 71.5, 106.4, null, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
        pointStart: Date.UTC(2012, 0, 1),
        pointInterval: 24 * 36e5
    }]

});