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) {
		galeria_zielona_over = newImage("images/galeria_zielona.jpg");
		oferta_over = newImage("images/oferta_active.jpg");
		plan_centrum_over = newImage("images/plan_centrum_active.jpg");
		dojazd_over = newImage("images/dojazd_active.jpg");
		galeria_over = newImage("images/galeria_active.jpg");
		kontakt_over = newImage("images/kontakt_active.jpg");
	    preloadFlag = true;
	}
}