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

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		btnHome_over = newImage("images/btnHome-over.jpg");
		btnUaacd_over = newImage("images/btnUaacd-over.jpg");
		btnPoetry_over = newImage("images/btnPoetry-over.jpg");
		btnFiction_over = newImage("images/btnFiction-over.jpg");
		btnNonFiction_over = newImage("images/btnNonFiction-over.jpg");
		btnEvents_over = newImage("images/btnEvents-over.jpg");
		btnArchives_over = newImage("images/btnArchives-over.jpg");
		btnDonate_over = newImage("images/btnDonate-over.jpg");
		btnContactUs_over = newImage("images/btnContactUs-over.jpg");
		btnWorkshops_over = newImage("images/btnWorkshops-over.jpg");
		
		btnHome_ = newImage("images/btnHome.jpg");
		btnUaacd_ = newImage("images/btnUaacd.jpg");
		btnPoetry_ = newImage("images/btnPoetry.jpg");
		btnFiction_ = newImage("images/btnFiction.jpg");
		btnNonFiction_ = newImage("images/btnNonFiction.jpg");
		btnEvents_ = newImage("images/btnEvents.jpg");
		btnArchives_over = newImage("images/btnArchives.jpg");
		btnDonate_ = newImage("images/btnDonate.jpg");
		btnContactUs_ = newImage("images/btnContactUs.jpg");
		btnWorkshops_ = newImage("images/btnWorkshops.jpg");
		preloadFlag = true;
	}
}