userAgent = window.navigator.userAgent;
browserVers = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function findElement(n,ly) {
	if (browserVers < 4)		return document[n];
	var curDoc = ly ? ly.document : document;
	var elem = curDoc[n];
	if (!elem) {
		for (var i=0;i<curDoc.layers.length;i++) {
			elem = findElement(n,curDoc.layers[i]);
			if (elem) return elem;
		}
	}
	return elem;
}

function changeImagesArray(array) {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<array.length; i+=2) {
			img = null;
			if (document.layers) {
				img = findElement(array[i],0);
			}
			else {
				img = document.images[array[i]];
			}
			if (img) {
				img.src = array[i+1];
			}
		}
	}
}

function changeImages() {
	changeImagesArray(changeImages.arguments);
}

function toggleImages() {
	for (var i=0; i<toggleImages.arguments.length; i+=2) {
		if (selected == toggleImages.arguments[i])      changeImagesArray(toggleImages.arguments[i+1]);
	}
}

var selected = '';
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		navBu_archives_head003 = newImage("images/navBu_archives_head-03.jpg");
		nav_bu_exhibitions005 = newImage("images/nav_bu_exhibitions-05.jpg");
		nav_bu_wurld007 = newImage("images/nav_bu_wurld-07.jpg");
		nav_bu_contact009 = newImage("images/nav_bu_contact-09.jpg");
		nav_archives_lake012 = newImage("images/nav_archives_lake-12.jpg");
		nav_archives_lake013 = newImage("images/nav_archives_lake-13.jpg");
		nav_overImageArea015 = newImage("images/nav_overImageArea-15.jpg");
		nav_overImageArea016 = newImage("images/nav_overImageArea-16.jpg");
		nav_overImageArea017 = newImage("images/nav_overImageArea-17.jpg");
		nav_overImageArea018 = newImage("images/nav_overImageArea-18.jpg");
		nav_overImageArea019 = newImage("images/nav_overImageArea-19.jpg");
		nav_overImageArea020 = newImage("images/nav_overImageArea-20.jpg");
		nav_overImageArea021 = newImage("images/nav_overImageArea-21.jpg");
		nav_overImageArea022 = newImage("images/nav_overImageArea-22.jpg");
		nav_overImageArea023 = newImage("images/nav_overImageArea-23.jpg");
		nav_overImageArea024 = newImage("images/nav_overImageArea-24.jpg");
		nav_overImageArea025 = newImage("images/nav_overImageArea-25.jpg");
		nav_overImageArea026 = newImage("images/nav_overImageArea-26.jpg");
		nav_overImageArea027 = newImage("images/nav_overImageArea-27.jpg");
		nav_archives_weber029 = newImage("images/nav_archives_weber-29.jpg");
		nav_archives_weber030 = newImage("images/nav_archives_weber-30.jpg");
		nav_archives_fay032 = newImage("images/nav_archives_fay-32.jpg");
		nav_archives_fay033 = newImage("images/nav_archives_fay-33.jpg");
		nav_archives_brooks035 = newImage("images/nav_archives_brooks-35.jpg");
		nav_archives_brooks036 = newImage("images/nav_archives_brooks-36.jpg");
		nav_archives_taylor038 = newImage("images/nav_archives_taylor-38.jpg");
		nav_archives_taylor039 = newImage("images/nav_archives_taylor-39.jpg");
		nav_archives_apPar041 = newImage("images/nav_archives_apPar-41.jpg");
		nav_archives_apPar042 = newImage("images/nav_archives_apPar-42.jpg");
		nav_archives_winch044 = newImage("images/nav_archives_winch-44.jpg");
		nav_archives_winch045 = newImage("images/nav_archives_winch-45.jpg");
		nav_archives_adams047 = newImage("images/nav_archives_adams-47.jpg");
		nav_archives_adams048 = newImage("images/nav_archives_adams-48.jpg");
		nav_archives_shainbaum050 = newImage("images/nav_archives_shainbaum-50.jpg");
		nav_archives_shainbaum051 = newImage("images/nav_archives_shainbaum-51.jpg");
		nav_archives_gadoury053 = newImage("images/nav_archives_gadoury-53.jpg");
		nav_archives_gadoury054 = newImage("images/nav_archives_gadoury-54.jpg");
		preloadFlag = true;
	}
}