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) {
		but1on = newImage("gfx/but1on.jpg");
		but2on = newImage("gfx/but2on.jpg");		
		but3on = newImage("gfx/but3on.jpg");
		but4on = newImage("gfx/but4on.jpg");
		but1off = newImage("gfx/but1.jpg");
		but2off = newImage("gfx/but2.jpg");		
		but3off = newImage("gfx/but3.jpg");
		but4off = newImage("gfx/but4.jpg");		
		but1gron = newImage("gfx/but1gron.jpg");
		but2gron = newImage("gfx/but2gron.jpg");		
		but3gron = newImage("gfx/but3gron.jpg");
		but4gron = newImage("gfx/but4gron.jpg");
		but1groff = newImage("gfx/but1gr.jpg");
		but2groff = newImage("gfx/but2gr.jpg");		
		but3groff = newImage("gfx/but3gr.jpg");
		but4groff = newImage("gfx/but4gr.jpg");		
		but1deon = newImage("gfx/but1deon.jpg");
		but2deon = newImage("gfx/but2deon.jpg");		
		but3deon = newImage("gfx/but3deon.jpg");
		but4deon = newImage("gfx/but4deon.jpg");
		but1deoff = newImage("gfx/but1de.jpg");
		but2deoff = newImage("gfx/but2de.jpg");		
		but3deoff = newImage("gfx/but3de.jpg");
		but4deoff = newImage("gfx/but4de.jpg");				
		preloadFlag = true;
	}
}