Access to restricted URI denied" code: "1012

I am trying to use WCF webservice method in my application using JQuery ., but  i am getting following error :-
Error: [Exception... "Access to restricted URI denied"  code: "1012" nsresult: "0x805303f4 (NS_ERROR_DOM_BAD_URI)"  location: "http://localhost:4107/assets/scripts/jquery-1.2.6.min.js Line: 28"]
Source File: http://localhost:4107/assets/scripts/jquery-1.2.6.min.js
Line: 28
and another  warning   : - Security Error: Content at http://localhost:4107/register.aspx may not load data from http://localhost/Service/CommonService.svc/CheckUserNameAvailability.
Here is ...