Overlapping Area Chart

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>

CSS

#chartdiv {
	width	: 100%;
	height	: 500px;
}

JavaScript

var chartData = generateChartData();

var chart = AmCharts.makeChart("chartdiv", {
    "type": "serial",
    "theme": "none",
    "pathToImages": "http://www.amcharts.com/lib/3/images/",
    "legend": {},
    "dataProvider": chartData,
    "valueAxes": [{
        // stackType control the stacking behaviour of the graphs
        // http://docs.amcharts.com/3/javascriptcharts/ValueAxis#stackType
        "stackType": "none",
        "position": "left"
    }],
    "graphs": [{
        "title": "Red",
        "valueField": "visits",
		"fillAlphas": 1
    }, {
        "title": "Yellow",
        "valueField": "hits",
		"fillAlphas": 1
    }, {
        "title": "Green",
        "valueField": "views",
		"fillAlphas": 1
    }],
    "chartScrollbar": {},
    "chartCursor": {},
    "categoryField": "date",
    "categoryAxis": {
        "parseDates": true,
        "axisColor": "#DADADA",
        "minorGridEnabled": true
    }
});

chart.addListener("dataUpdated", zoomChart);
zoomChart();


// generate some random data, quite different range
function generateChartData() {
    var chartData = [];
    var firstDate = new Date();
    firstDate.setDate(firstDate.getDate() - 100);

    for (var i = 0; i < 100; i++) {
        // we create date objects here. In your data, you can have date strings
        // and then set format of your dates using chart.dataDateFormat property,
        // however when possible, use date objects, as this will speed up chart rendering.
        var newDate = new Date(firstDate);
        newDate.setDate(newDate.getDate() + i);

        var visits = Math.round(Math.random() * 100) + 50;
        var hits = Math.round(Math.random() * 100) + 50;
        var views = Math.round(Math.random() * 100) + 50;

        chartData.push({
            date: newDate,
            visits: visits,
            hits: hits,
            views: views
        });
    }
    return chartData;
}

function zoomChart(){
    chart.zoomToIndexes(chart.dataProvider.length - 20,...