browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
var ver = false;
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) ver = true;
if (browserName == "Netscape" && browserVer >= 3) ver = true;

if (ver)
{
	cart_acc = new Image();
	cart_acc.src = 'images/cart_acceso.gif';
	busta_acc = new Image();
	busta_acc.src = 'images/busta_accesa.gif';
	load = true;
}

function ON_img(NomeImg) {
	if (ver && load) 
		eval("document." + NomeImg + ".src = " + NomeImg + "_acc.src");		
}

function OFF_img(NomeImg) {
	if (ver && load)
		eval("document." + NomeImg + ".src = 'images/" + NomeImg + ".gif'"); 
}