WCF RESTFull service with Ajax POST

yes I am and I have created a Test service. but the POST from Ajax is not Working. GET Method is working fine. I have checked the issue and got some hints like, "cross-domain" issue. But I can't resolved that. Pleas help me. Thanks in Advance

This is my code
----------------------------

[ServiceContract]
public interface IUserSevices
{
[OperationContract]
[WebInvoke(UriTemplate = "/UserChangePassword", Method = "POST", RequestFormat = WebMessageFormat.Json)]
string ChangePassword(Users user);
}



public string ChangePassword(Users user)
{
return user.NewPassword;
}




<script>

function ImporterChangePassword() {
var impData = {
"ExporterCDId": "3",
"ImporterId": "5",
"CompanyCode": "COMCODE999",
"OldPassword":"imp2",
"NewPassword": "imp1"
};
$.ajax({
cache: false,
async: true,
type: "POST",
url: "http://localhost:35153/TestService.svc/Users/UserChangePassword",
data: JSON.stringify(impData),
contentType: "application/json; charset=utf-8",
dataType: "json",
processData: true,
success: function (data, status, jqXHR) {
alert("success..." + data);
},
statusCode: {
400: function (jxhr, textStatus, errorThrown) {
alert(textStatus);
},
401: function () {
alert("401");
}
},
error: function (xhr) {
alert(xhr.responseText);
}
});
}

</script>