[Solved]-Change title when drilldown in Highcharts-Highcharts

for example using drilldown and drillup events (api), a couple of variables and chart.settitle (api). like this:

var defaulttitle = "basic drilldown";
var drilldowntitle = "more about ";

var chart = new highcharts.chart({
    chart: {
        type: 'column',
        renderto: 'container',
        events: {
            drilldown: function(e) {
                chart.settitle({ text: drilldowntitle + e.point.name });
            },
            drillup: function(e) {
                chart.settitle({ text: defaulttitle });
            }
        }
    },
    title: {
        text: defaulttitle
    },
    // ... more options
});

see this jsfiddle demonstration.