onerror=handleErr;

function handleErr(msg,url,l) {
	txt = "There was an error on this page.\n\n";
	txt += "Error: " + msg + "\n";
	txt += "URL: " + url + "\n";
	txt += "Line: " + l + "\n\n";
	txt += "Click OK to continue.\n\n";
	alert(txt);
	return true;
}