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) {
		contacto = newImage("images/layout/contacto.gif");
		serviceso = newImage("images/layout/serviceso.gif");
		productso = newImage("images/layout/productso.gif");
		abouto = newImage("images/layout/abouto.gif");
		promo5o = newImage("images/promos/promo5o.jpg");
		promo4o = newImage("images/promos/promo4o.jpg");
		promo3o = newImage("images/promos/promo3o.jpg");
		promo2o = newImage("images/promos/promo2o.jpg");
		promo1o = newImage("images/promos/promo1o.jpg");
		preloadFlag = true;
	}
}