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) {
		btnHome_over = newImage("images/barra/btnHome-over.gif");
		btnAudio_over = newImage("images/barra/btnAudio-over.gif");
		btnVideo_over = newImage("images/barra/btnVideo-over.gif");
		btnTesti_over = newImage("images/barra/btnTesti-over.gif");
		btnBarze_over = newImage("images/barra/btnBarze-over.gif");
		btnVignette_over = newImage("images/barra/btnVignette-over.gif");
		btnExec_over = newImage("images/barra/btnExec-over.gif");
		btnForum_over = newImage("images/barra/btnForum-over.gif");
		btnPPS_over = newImage("images/barra/btnPPS-over.gif");
		preloadFlag = true;
	}
}