I get a script error on line 8007 whenever I click on the page, which seems
to prevent anything from working.

// hide all levels
hide: function() {
        self = this;            <---- Right here.
        setTimeout(function() {
                self.wrapper.find('ol').hide();
        }, self.options.hideDelay);

It's trying to assign the global scope (window) object itself, and in IE,
"window.self" is a read-only value, so it breaks.

JK