$().ajaxStart(waitScreen);
$().ajaxStop($.unblockUI);

function waitScreen() {
    $.blockUI({
        message: '<img src="images/loadingAnimation.gif" />',
        css: {
            border: 'none',
            padding: '15px',
            backgroundColor: '#000',
            '-webkit-border-radius': '10px',
            '-moz-border-radius': '10px',
            opacity: .5,
            color: '#fff'
        }
    });
}
function AjaxError(result) {
    showMessage("There was an error upon your request" + result.status + ' ' + result.statusText);
}
function showMessage(msg) {
    $('#message_text').text(msg);
    $('#message_box').show('pulsate');
}