var preloadFlag = false;

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 (preloadFlag) {
		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];
			}
		}
	}
}

function preloadImgs() {
	if (document.images) {
		spyglass_over = newImage("images/spyglass-over.jpg");
		compass_over = newImage("images/compass-over.jpg");
		note_over = newImage("images/note-over.gif");
		pen_over = newImage("images/pen-over.jpg");
		journal_over = newImage("images/journal-over.jpg");
		Turkmenistan_over = newImage("images/world/Turkmenistan_over.gif");
		Tajikistan_over = newImage("images/world/Tajikistan_over.gif");
		Kyrgyzstan_over = newImage("images/world/Kyrgyzstan_over.gif");
		Kazakhstan_over = newImage("images/world/Kazakhstan_over.gif");
		Uzbekistan_over = newImage("images/world/Uzbekistan_over.gif");
		the_world_central_asia_over = newImage("images/world/the-world-central-asia_over.gif");
		preloadFlag = true;
	}
}