var loaded = false;

if (document.images) {
	img1off = new Image();
	img1off.src = "/CremonaTrasporti/Toolbars/Linee/btn_linee_off.jpg";
	img2off = new Image();
	img2off.src = "/CremonaTrasporti/Toolbars/Linee/btn_servizio_off.jpg";
	img4off = new Image();
	img4off.src = "/CremonaTrasporti/Toolbars/Linee/btn_mappa_off.jpg";    
}

function imageLoad() {
	if (document.images) {
		img1on = new Image();
		img1on.src = "/CremonaTrasporti/Toolbars/Linee/btn_linee_on.jpg";
		img2on = new Image();
		img2on.src = "/CremonaTrasporti/Toolbars/Linee/btn_servizio_on.jpg";
		img4on = new Image();
		img4on.src = "/CremonaTrasporti/Toolbars/Linee/btn_mappa_on.jpg";    
		return (loaded = true);
	}
}

function rollOut(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName+"off.src");
	}
}

function rollIn(imgName) {
	if (document.images && (loaded == true)) {
		document[imgName].src = eval(imgName+"on.src");
	}
}