Auto-updating OHLC chart

HTML

<script src="http://www.amcharts.com/lib/amcharts.js" type="text/javascript"></script>
<div id="chartdiv" style="width: 100%; height: 340px;"></div>

CSS

body
{
    font-size:12px;
    color:#000000;
    background-color:#ffffff;
    font-family:verdana,helvetica,arial,sans-serif;
}

JavaScript

var chart;
var chartData = [];
var chartCursor;
var currentDate = new Date();
var firstDate = new Date(currentDate.getTime() - 300 * 60000);

// generate some random data, quite different range
function generateChartData() {
    chartData = [];
    for (minute = 0; minute < 300; minute += 15) {
        var newDate = new Date(firstDate.getTime() + minute * 60000);
        var open = Math.round(Math.random() * 40);
        var high = open + open * Math.random();
        var low = open - open * Math.random();
        var close = Math.round(Math.random() * 40);

        chartData.push({
            date: newDate,
            open: open,
            high: high,
            low: low,
            close: close
        });
    }
}

// create chart
AmCharts.ready(function() {
    // generate some data first
    generateChartData();

    // SERIAL CHART    
    chart = new AmCharts.AmSerialChart();
    chart.pathToImages = "http://www.amcharts.com/lib/images/";
    chart.marginTop = 0;
    chart.marginRight = 10;
    chart.autoMarginOffset = 5;
    chart.zoomOutButton = {
        backgroundColor: '#000000',
        backgroundAlpha: 0.15
    };
    chart.dataProvider = chartData;
    chart.categoryField = "date";

    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.parseDates = true; // as our data is date-based, we set parseDates to true
    categoryAxis.minPeriod = "15mm"; // our data is daily, so we set minPeriod to DD
    categoryAxis.dashLength = 1;
    categoryAxis.gridAlpha = 0.15;
    categoryAxis.startOnAxis = false;
    categoryAxis.axisColor = "#DADADA";

    // value                
    var valueAxis = new AmCharts.ValueAxis();
    valueAxis.axisAlpha = 0.2;
    valueAxis.dashLength = 1;
    valueAxis.minimum = 0;
    valueAxis.maximum = 60;
    chart.addValueAxis(valueAxis);

    // GRAPH
    var graph = new AmCharts.AmGraph();
    graph.title = "red line";
    graph.type = "ohlc";
    graph.openField = "open";
   ...