ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px"></div>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/mootools/1.4.3/mootools-yui-compressed.js"></script>

<script class="jsbin" src="https://raw.github.com/highslide-software/highcharts.com/v2.2.0/js/adapters/mootools-adapter.src.js"></script>
<script src="http://code.highcharts.com/2.2/highcharts.js"></script><script>

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },

    series: [{
            events: {
                "legendItemClick": function(event) { alert('alert'); }
            },
        
            data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]}]
});