Try:

this.fn = function(event){
    var element = event.target,
        stop = false;

    while (element != document.body && element.nodeType == 1){
        if (element == this.calendar) stop = true;

        this.calendars.each(function(calendar){
            if (calendar.button == element || calendar.els.contains(element))
                stop = true;
        });

        if (stop){
            event.stop();
            return false;
        }

        element = element.getParent();
    }

    this.toggle(cal);
}.bind(this);

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