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) {
		id11_sopra = newImage("imgs/11_profilo.gif");
		id12_sopra = newImage("imgs/12_knowhow.gif");
		id13_sopra = newImage("imgs/13_strategie.gif");
		id14_sopra = newImage("imgs/14_servizi.gif");
		id15_sopra = newImage("imgs/15_lavoro.gif");
		id16_sopra = newImage("imgs/16_contatti.gif");
		id17_sopra = newImage("imgs/17_prodotti.gif");
		ENG_sopra = newImage("imgs/10_eng_up.gif");
		HOME_sopra = newImage("imgs/50_gohome_up.gif");
		preloadFlag = true;
	}
}