gistfile1.txt

You have:

    options = Object.extend(Object.extend({ }, options));
    
    options = {
        openClass: options.openClass ? options.openClass : "open",
        disclosureWidgetClass: options.disclosureWidgetClass ? options.disclosureWidgetClass : "disclosure-widget",
        disclosureEvent: options.disclosureEvent ? options.disclosureEvent : "click"
    }

Should be:
    var defaults = {
        openClass: "open",
        disclosureWidgetClass: "disclosure-widget",
        disclosureEvent: "click"
    };

    options = Object.extend(Object.extend({}, defaults), options || { });

or:

    options = Object.extend({
        openClass: "open",
        disclosureWidgetClass: "disclosure-widget",
        disclosureEvent: "click"
    }, options || { });