Access denied to jQuery script on IE

IE requires you to use XDomainRequest instead of XHR for cross site, you can try something like...

if ($.browser.msie && window.XDomainRequest) {
            // Use Microsoft XDR
            var xdr = new XDomainRequest();
            xdr.open("get", url);
            xdr.onload = function() {
                // XDomainRequest doesn't provide responseXml, so if you need it:
                var dom = new ActiveXObject("Microsoft.XMLDOM");
                dom.async = false;
                dom.loadXML(xdr.responseText);
            };
            xdr.send();
        } else {
            // your ajax request here
            $$.ajax({
                   url: thisURL,
                   dataType: "json",
                   data: {cmd : 'getMessage', uurl: urlVar, t: Math.random()},
                   success: function(ret){
                               callback(ret)
                    }
            });

        }

Reference

http://forum.jquery.com/topic/cross-domain-ajax-and-ie

not sure whether it fits your scenario

xdr = new XDomainRequest(); 
xdr.onload=function()
{
    alert(xdr.responseText);
}
xdr.open("GET", thisUrl); //thisURl ->your cross domain request URL 
//pass your data here
xdr.send([data]); 

you can find some more guidance here

This solved the issue gracefully for me:

https://github.com/MoonScript/jQuery-ajaxTransport-XDomainRequest

Just install/compile after jQuery and before your script and use the $.ajax method as you normally would, the rest is handled behind the automatically.

Have you try to use the lastest of JQuery(> jquery-1.8.0)? Since the version 1.8.0, they solved some IE9's bugs. Perhaps this one too.

http://blog.jquery.com/2012/08/30/jquery-1-8-1-released/

I had a similar problem and the solution for me was to use jsonp instead of json. That way I didn't have to break out a customer version for IE.

You can only do this if the json server host supports the callback request variable or you have access to the server and can add support. Here is a page that helped me understand the process. Its .net mvc focused, but it gives a good over view of the diffrence between json and jsonp.

http://blogorama.nerdworks.in/entry-EnablingJSONPcallsonASPNETMVC.aspx