V3: Column clustered

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js" type="text/javascript"></script>
<script src="http://www.amcharts.com/lib/3/serial.js" type="text/javascript"></script>
<div id="chartdiv" style="width: 100%; height: 362px;"></div>

JavaScript

var chart;

var chartData = [{
    "month": "Jan",
        "income": 23.5,
        "expenses": 18.1
}, {
    "month": "Feb",
        "income": 26.2,
        "expenses": 22.8
}, {
    "month": "Mar",
        "income": 30.1,
        "expenses": 23.9
}, {
    "month": "Apr",
        "income": 29.5,
        "expenses": 25.1
}, {
    "month": "May",
        "income": 24.6,
        "expenses": 25
}];


AmCharts.ready(function () {
    // SERIAL CHART
    chart = new AmCharts.AmSerialChart();
    chart.dataProvider = chartData;
    chart.categoryField = "month";
    chart.startDuration = 1;
    chart.plotAreaBorderColor = "#DADADA";
    chart.plotAreaBorderAlpha = 1;

    // AXES
    // Category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.gridPosition = "start";
    categoryAxis.gridAlpha = 0.1;
    categoryAxis.axisAlpha = 0;

    // Value
    var valueAxis = new AmCharts.ValueAxis();
    valueAxis.axisAlpha = 0;
    valueAxis.gridAlpha = 0.1;
    valueAxis.position = "top";
    chart.addValueAxis(valueAxis);

    // GRAPHS
    // first graph
    var graph1 = new AmCharts.AmGraph();
    graph1.type = "column";
    graph1.title = "Income";
    graph1.valueField = "income";
    graph1.balloonText = "Income:[[value]]";
    graph1.lineAlpha = 0;
    graph1.fillColors = "#ADD981";
    graph1.fillAlphas = 1;
    chart.addGraph(graph1);

    // second graph
    var graph2 = new AmCharts.AmGraph();
    graph2.type = "column";
    graph2.title = "Expenses";
    graph2.valueField = "expenses";
    graph2.balloonText = "Expenses:[[value]]";
    graph2.lineAlpha = 0;
    graph2.fillColors = "#81acd9";
    graph2.fillAlphas = 1;
    chart.addGraph(graph2);

    // LEGEND
    var legend = new AmCharts.AmLegend();
    chart.addLegend(legend);

    // WRITE
    chart.write("chartdiv");
});