// You also need proxy_xmlhttp to use this

(function($) {
/**
 * This is for Cross-site Origin Resource Sharing (CORS) requests.
 *
 * Additionally the script will fail-over to a proxy if you have one set up.
 *
 * @param string   url      the url to retrieve
 * @param mixed    data     data to send along with the get request [optional]
 * @param function callback function to call on successful result [optional]
 * @param string   type     the type of data to be returned [optional]
 */
$.getCORS = function (url, data, callback, type) 
	{
	if (typeof window.XDomainRequest != 'undefined')  // IE
		{
            var xdr = new XDomainRequest();
            xdr.onload = function() {
                callback(this.responseText, 'success');
            };
            xdr.open("get", url, true);
            xdr.send();
   		}
	else
		{
        jQuery.get(url, data, callback, type);
		}
	}

/**
 * This method is for Cross-site Origin Resource Sharing (CORS) POSTs
 *
 * @param string   url      the url to post to
 * @param mixed    data     additional data to send [optional]
 * @param function callback a function to call on success [optional]
 * @param string   type     the type of data to be returned [optional]
 */
$.postCORS = function (url, data, callback, type) {
    try {
        // Try using jQuery to POST
        jQuery.post(url, data, callback, type);
    } catch(e) {
        // jQuery POST failed
        var params = '';
        for (key in data) {
            params = params+'&'+key+'='+data[key];
        }
        // Try XDR, or use the proxy
        if (jQuery.browser.msie && window.XDomainRequest) {
            // Use XDR
            var xdr = new XDomainRequest();
            xdr.open("post", url);
            xdr.send(params);
            xdr.onload = function() {
                callback(xdr.responseText, 'success');
            };
        } else {
            try {
                // Use the proxy to post the data.
                request = new proxy_xmlhttp();
                request.open('POST', url, true);
                request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
                request.send(params);
            } catch(e) {
                // could not post using the proxy
            }
        }
    }
}
})(jQuery);