Javascript CORS Ajax request IE < 9 fallback.

myAjaxFunction.js

myAjaxFunction: function(attributes, callback) {
    if ($.browser.msie && window.XDomainRequest && parseInt($.browser.version) <= 9) {
        var xdr = new XDomainRequest();
        xdr.open('POST', 'URL', true);
        xdr.send(attributes);
        xdr.onload = function() {
            callback(JSON.parse(xdr.responseText));
        }
    } else {
        $.ajax({
            type: 'POST',
            url: 'URL',
            dataType: 'json',
            crossDomain: true,
            data: attributes
        }).done(function( data ) {
           callback(data);
        }); 
    }
}