in themes/lucene/static/javascript/lucene/slides.js [89:98]
updateSlide: function(next_slide) {
if (next_slide > this.end_slide) {
next_slide = 0;
}
else if ( next_slide == -1 ) {
next_slide = this.end_slide;
}
this.fadeInOut(next_slide, this.current_slide);
},