function initLightbox() {
	if (!document.getElementsByTagName) return false;
	var alllinks = document.getElementsByTagName("a");
	for (var i = 0; i < alllinks.length; i++) {
		var curlink = alllinks[i].getAttribute("href");
		if (curlink != null) {
			if ((curlink.indexOf(".gif") >= 0) || (curlink.indexOf(".jpg") >= 0)) {
				alllinks[i].setAttribute("rel","lightbox");
			}
		}
	}
	myLightbox = new Lightbox();
}

Event.observe(window, 'load', initLightbox, false);