How to achieving cross domain ajax calls with Jquery??

How to achieving cross domain ajax calls with Jquery??

Hi, 
I am new to JQuery. I got a situation to use cross domain ajax calls. 
The code sample is here. When i am trying to invoke post (update data) i am getting error. To resolve that i placed JSNOP as commented in update. But the problem is all the request sent are only as GET even that was post. How to resolve the cross domain issue..please help me
  1. dataSource = new xxx.data.DataSource({
  2.                         transport: {
  3.                             read: {
  4.                                 url: "http://localhost:53985/Service.svc/XmlService/CAccountDetails",
  5.                                 type: "GET"
  6.                             },
  7.                             update: {                                
  8.                                 url: "http://localhost:53985/Service.svc/XmlService/CAccountDetails",
  9.                                 type: "POST",
  10.                                 crossDomain: true,
  11.                                 //dataType: "jsonp"                               
  12.                             },