SimpleLightbox.defaults = {

                // add custom classes to lightbox elements
                elementClass: '',
                elementLoadingClass: 'slbLoading',
                htmlClass: 'slbActive',
                closeBtnClass: '',
                nextBtnClass: '',
                prevBtnClass: '',
                loadingTextClass: '',

                // customize / localize controls captions
                closeBtnCaption: 'Close',
                nextBtnCaption: 'Next',
                prevBtnCaption: 'Previous',
                loadingCaption: 'Loading...',

                bindToItems: true, // set click event handler to trigger lightbox on provided $items
                closeOnOverlayClick: true,
                closeOnEscapeKey: true,
                nextOnImageClick: true,
                showCaptions: true,

                captionAttribute: 'title', // choose data source for library to glean image caption from
                urlAttribute: 'href', // where to expect large image

                startAt: 0, // start gallery at custom index
                loadingTimeout: 100, // time after loading element will appear

                appendTarget: 'body', // append elsewhere if needed

                beforeSetContent: null, // convenient hooks for extending library behavoiur
                beforeClose: null,
                beforeDestroy: null,

                videoRegex: new RegExp(/youtube.com|vimeo.com/) // regex which tests load url for iframe content

            };