Syncing zoom across several date-based serial charts

HTML

<script type="text/javascript" src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/serial.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/themes/none.js"></script>
<div id="chartdiv"></div>
<div id="chartdiv2"></div>

CSS

body {
    font-family: Verdana;
    font-size: 12px;
    padding: 10px;
}

#chartdiv, #chartdiv2 {
	width	: 100%;
	height	: 300px;
}

JavaScript

var chartConfig = {
        "type": "serial",
        "theme": "none",
        "pathToImages": "http://www.amcharts.com/lib/3/images/",
        "dataDateFormat": "YYYY-MM-DD",
        "graphs": [{
            "bullet": "round",
            "bulletBorderAlpha": 1,
            "bulletColor": "#FFFFFF",
            "bulletSize": 5,
            "hideBulletsCount": 50,
            "lineThickness": 2,
            "title": "red line",
            "useLineColorForBulletBorder": true,
            "valueField": "value"
        }],
        "chartCursor": {
        },
        "categoryField": "date",
        "categoryAxis": {
            "parseDates": true,
            "dashLength": 1,
            "minorGridEnabled": true,
            "position": "top"
        },
        "dataProvider": [{
            "date": "2012-07-27",
            "value": 13
        }, {
            "date": "2012-07-28",
            "value": 11
        }, {
            "date": "2012-07-29",
            "value": 15
        }, {
            "date": "2012-07-30",
            "value": 16
        }, {
            "date": "2012-07-31",
            "value": 18
        }, {
            "date": "2012-08-01",
            "value": 13
        }, {
            "date": "2012-08-02",
            "value": 22
        }, {
            "date": "2012-08-03",
            "value": 23
        }, {
            "date": "2012-08-04",
            "value": 20
        }, {
            "date": "2012-08-05",
            "value": 17
        }, {
            "date": "2012-08-06",
            "value": 16
        }, {
            "date": "2012-08-07",
            "value": 18
        }, {
            "date": "2012-08-08",
            "value": 21
        }, {
            "date": "2012-08-09",
            "value": 26
        }, {
            "date": "2012-08-10",
            "value": 24
        }, {
            "date": "2012-08-11",
            "value": 29
        }, {
            "date": "2012-08-12",
            "value": 32
        }, {
 ...