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("images/but1on-en.jpg");
		but2on = newImage("images/but2on-en.jpg");		
		but3on = newImage("images/but3on-en.jpg");
		but4on = newImage("images/but4on-en.jpg");
		but5on = newImage("images/but5on-en.jpg");		
		but1of = newImage("images/but1-en.jpg");
		but2of = newImage("images/but2-en.jpg");		
		but3of = newImage("images/but3-en.jpg");
		but4of = newImage("images/but4-en.jpg");		
		but5of = newImage("images/but5-en.jpg");		
		probut1on = newImage("images/prodbut1on-en.jpg");
		probut2on = newImage("images/prodbut2on-en.jpg");		
		probut3on = newImage("images/prodbut3on-en.jpg");
		probut4on = newImage("images/prodbut4on-en.jpg");
		probut1of = newImage("images/prodbut1-en.jpg");
		probut2of = newImage("images/prodbut2-en.jpg");		
		probut3of = newImage("images/prodbut3-en.jpg");
		probut4of = newImage("images/prodbut4-en.jpg");		
		side1on = newImage("gfx/sidepic-main1.jpg");		
		side2on = newImage("gfx/sidepic-main2.jpg");		
		side3on = newImage("gfx/sidepic-main3.jpg");		
		side4on = newImage("gfx/sidepic-main4.jpg");				
		preloadFlag = true;
	}
}