Connect multiple series visibility in Highcharts

connected-series.js

Highcharts.Series.prototype.toggleConnected = function(visible) {
    var visibility = visible || !this.visible,
        series = this.options.connectedSeries,
        l = series.length,
        serie;

    while (l--) {
        serie = this.chart.get(series[l]);
        serie.setVisible(visibility, false);
        serie.checkbox && (serie.checkbox.checked = visibility);
    }

    this.setVisible(!visibility);
    this.checkbox && (this.checkbox.checked = visibility);
}