function investigate(ev) {
        if(ev.which === 2) {
          return;
        }
        ev.preventDefault();
        var choice = $('.choices li', groupNode)[choices[choices.length - 1][choiceIndex[choiceIndex.length - 1]]];
        if (choice.hasAttribute('next-group')) {
            cleanUpCurrent();
            switchGroup(choice.getAttribute('next-group'));
        } else {
            window.open(choice.getAttribute('target'));
        }
    }