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

    plotOptions: {
        pie: {
            states: {
                hover: {
                    brightness: 0.5
                }
            }
        }
    },

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