What I did to change behaviour in IE was a change in apa folder Js slimbox.js at the end of the file from:
function initLightbox() { window.addEvent('domready', Lightbox.init.bind(Lightbox)) }
window.addEvent('domready', Lightbox.init.bind(Lightbox));
to
function initLightbox() ;//{ window.addEvent('domready', Lightbox.init.bind(Lightbox)) };
//window.addEvent('domready', Lightbox.init.bind(Lightbox));
But I guess it's a very dirty coding as I did. And of course the fading effect left, and IE gives me an error as you stated.
Any suggestion is really appreciated, Saka.