add/remove series

HTML

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

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    
    series: [1,3,4]
}, function(chart){

    $('#add').click(function(){
        chart.addSeries({
            data: (function(){
                for(var i=0, arr=[]; i<20; i++)
                    arr.push(Math.random());
                return arr;
            })()
        })
    });
    
    $('#remove').click(function(){
        while (chart.series.length)
            chart.series[0].remove();
    });



});