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) {
		but1gron = newImage("gfx/but01gron.jpg");
		but2gron = newImage("gfx/but02gron.jpg");		
		but3gron = newImage("gfx/but03gron.jpg");
		but4gron = newImage("gfx/but04gron.jpg");
		but5gron = newImage("gfx/but05gron.jpg");
		but6gron = newImage("gfx/but06gron.jpg");		
		but1gr = newImage("gfx/but01gr.jpg");
		but2gr = newImage("gfx/but02gr.jpg");		
		but3gr = newImage("gfx/but03gr.jpg");
		but4gr = newImage("gfx/but04gr.jpg");
		but5gr = newImage("gfx/but05gr.jpg");
		but6gr = newImage("gfx/but06gr.jpg");		
		but1enon = newImage("gfx/but01enon.jpg");
		but2enon = newImage("gfx/but02enon.jpg");		
		but3enon = newImage("gfx/but03enon.jpg");
		but4enon = newImage("gfx/but04enon.jpg");
		but5enon = newImage("gfx/but05enon.jpg");
		but6enon = newImage("gfx/but06enon.jpg");		
		but1en = newImage("gfx/but01en.jpg");
		but2en = newImage("gfx/but02en.jpg");		
		but3en = newImage("gfx/but03en.jpg");
		but4en = newImage("gfx/but04en.jpg");		
		but5en = newImage("gfx/but05en.jpg");
		but6en = newImage("gfx/but06en.jpg");				
		preloadFlag = true;
	}
}