How to display the value instead of percentage in a pie chart using jquery Highcharts

for a project of mine im using a pie char that made with jQuery Highcharts. what like to do is to display the value i inserted instead of the the parentage. example: chart shows firefox - 43.269...% instead i like to show the value Firefox -45 clicks. can anyone help me with this. thanks in advance.

Chart code

<!-- 1. Add these JavaScript inclusions in the head of your page -->
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
    <script type="text/javascript" src="../js/highcharts.js"></script>

    <!-- 1a) Optional: add a theme file -->
    <!--
        <script type="text/javascript" src="../js/themes/gray.js"></script>
    -->

    <!-- 1b) Optional: the exporting module -->
    <script type="text/javascript" src="../js/modules/exporting.js"></script>


    <!-- 2. Add the JavaScript to initialize the chart on document ready -->
    <script type="text/javascript">

        var chart;
        $(document).ready(function() {
            chart = new Highcharts.Chart({
                chart: {
                    renderTo: 'browser_cart',
                    plotBackgroundColor: null,
                    plotBorderWidth: null,
                    plotShadow: false
                },
                title: {
                    text: 'Browser market shares at a specific website, 2010'
                },
                tooltip: {
                    formatter: function() {
                        return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';
                    }
                },
                plotOptions: {
                    pie: {
                        allowPointSelect: true,
                        cursor: 'pointer',
                        dataLabels: {
                            enabled: true,
                            color: '#000000',