added correct IE detection; only init controls when images > 1
added correct IE detection; only init controls when images > 1

olegshilov/jsOnlyLightbox,mohan43u/jsOnlyLightbox,mohan43u/jsOnlyLightbox,actorapp/jsOnlyLightbox,olegshilov/jsOnlyLightbox,actorapp/jsOnlyLightbox,felixhagspiel/jsOnlyLightbox,felixhagspiel/jsOnlyLightbox