ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px; width: 500px"></div>
<div id="container2" style="height: 400px; width: 500px"></div>

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container',
        marginBottom: 80
    },
    yAxis: {
        labels: {
            formatter: function() {
                return this.value;
            }
        }
    },
    
    series: [{
        data: (function(){
            var arr = [];
            for(i=0; i<15; i++)
                arr[i] = Math.random() * 100000;
            return arr;
        })()       
    }]
});

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container2',
        marginBottom: 80
    },
    
    series: [{
        data: (function(){
            var arr = [];
            for(i=0; i<15; i++)
                arr[i] = Math.random() * 100000;
            return arr;
        })()       
    }]
});