function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		about_over = newImage("images/onasover.gif");
		portfolio_over = newImage("images/kontaktover.gif");
		oferta_over1 = newImage("images/pal_02a.gif");
		oferta_over2 = newImage("images/pal_02b.gif");
		oferta_over3 = newImage("images/pal_02c.gif");
		oferta_over4 = newImage("images/pal_02d.gif");
		oferta_over1 = newImage("images/pal_02e.gif");
		oferta_over2 = newImage("images/pal_02f.gif");
		oferta_over3 = newImage("images/pal_02g.gif");
		oferta_over4 = newImage("images/pal_02h.gif");
		preloadFlag = true;
	}
}