Highcharts.chart('container', {
    chart: {
        type: 'pie'
    },

    plotOptions: {
        pie: {
            allowPointSelect: true,
            slicedOffset: 20
        }
    },

    series: [{
        data: [
            {
                name: 'Firefox',
                y: 44.2,
                selected: true,
                sliced: true
            },
            ['IE7',       26.6],
            ['IE6',       20],
            ['Chrome',    3.1],
            ['Other',    5.4]
        ]
    }]
});