function isIE() { return (navigator.appName == "Microsoft Internet Explorer"); }
function isNav() { return (navigator.appName == "Netscape"); }
function isNav4() { return ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) == 4)); }

function ignoreIEUnspecifiedError()
{
	window.onerror = _ignoreIEUnspecifiedError;
}

function _ignoreIEUnspecifiedError(sError)
{
	if (isIE())
		window.event.returnValue = (sError.toLowerCase().indexOf('unspecified error') >= 0);
}