Read records synchronously using JSON in CRM 2011

function retrieveRecordsSynchronously() {

     var retrieveRecordsReq = new XMLHttpRequest();

     var ODataPath = Xrm.Page.context.getServerUrl() + "/XRMServices/2011/OrganizationData.svc/AccountSet";

     retrieveRecordsReq.open('GET', ODataPath, false);

     retrieveRecordsReq.setRequestHeader("Accept", "application/json");

     retrieveRecordsReq.setRequestHeader("Content-Type", "application/json; charset=utf-8");

     retrieveRecordsReq.send(null);

     var records = JSON.parse(retrieveRecordsReq.responseText).d;

     //Read the first account name

     alert('First Account Name is: ' + records.results[0].Name);

 }