Syncing cursors on separate serial date-based 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": {
            "pan": true
        },
        "categoryField": "date",
        "categoryAxis": {
            "parseDates": true,
            "dashLength": 1,
            "minorGridEnabled": true,
            "position": "top"
        },
        "dataProvider": [{
            "date": "2012-12-07",
            "value": 78
        }, {
            "date": "2012-12-08",
            "value": 78
        }, {
            "date": "2012-12-09",
            "value": 74
        }, {
            "date": "2012-12-10",
            "value": 73
        }, {
            "date": "2012-12-11",
            "value": 75
        }, {
            "date": "2012-12-12",
            "value": 70
        }, {
            "date": "2012-12-13",
            "value": 77
        }, {
            "date": "2012-12-14",
            "value": 67
        }, {
            "date": "2012-12-15",
            "value": 62
        }, {
            "date": "2012-12-16",
            "value": 64
        }, {
            "date": "2012-12-17",
            "value": 61
        }, {
            "date": "2012-12-18",
            "value": 59
        }, {
            "date": "2012-12-19",
            "value": 53
        }, {
            "date": "2012-12-20",
            "value": 54
        }, {
            "date": "2012-12-21",
            "value": 56
        }, {
            "date": "2012-12-22",
            "value": 59
        }, {
            "date": "2012-12-23",
           ...