jQuery: Global AJAX Error Handler

 
$(document).ready(function () {
	$.ajaxSetup({
		error: function (x, e) {
			if (x.status == 0) {
				alert('Network error');
			} else if (x.status == 404) {
				alert('404 Page not found'); 
			} else if (x.status == 500) {
				// assume msft brings error page back with a useful title
				var titleMatch = /(.*?)<\/title>/.exec(x.responseText); 
				var titleString = titleMatch ? titleMatch[1] : '';
				alert('Oops!\n\n500 Internal Server Error\n\n' + titleString);
			} else if (e == 'parsererror') {
				alert('Error.\nParsing JSON Request failed.');
			} else if (e == 'timeout') {
				alert('Request Time out.');
			} else {
				alert('Unkown error: ' + x.status + ' ' + x.statusText + '\n\n' + x.responseText);
			}
		}
		});
});