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) {
		prooba_P = newImage("images/prooba-P.jpg");
		prooba_P007 = newImage("images/prooba-P-07.jpg");
		prooba_P009 = newImage("images/prooba-P-09.jpg");
		prooba_P011 = newImage("images/prooba-P-11.jpg");
		prooba_P013 = newImage("images/prooba-P-13.jpg");
		prooba_P015 = newImage("images/prooba-P-15.jpg");
		prooba_P017 = newImage("images/prooba-P-17.jpg");
		prooba_091_ponad = newImage("images/prooba_091-ponad.jpg");
		prooba_101_ponad = newImage("images/prooba_101-ponad.jpg");				
		preloadFlag = true;
	}
}