How Do I Store A Value Returned From A Ajax Function

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Javascript

jQuery

Hi
I am currently using Ajax to post data to a web service in vb.net

My code runs all well up until the the success function(r)

I need to post data to the webservice and return another value
Please could you assist

here is my code for the ajax

var selectedFields = ($('#result').val());
            var Qid = '<%=Session("Qid")%>';
            var DrawnName= document.getElementById('<%=DrawnName.ClientID%>').value;
 var Uid = document.getElementById('<%=HiddenField1.ClientID%>').value;

$.ajax({

               url: 'Drawn.aspx/SelectedPoints',
               data: "{ 'selectedFields': '" + selectedFields + "','Qid':'" + Qid + "','DrawnName':'" + DrawnName + "','Uid':'" + Uid + "'}",
               dataType: "json",
               type: 'POST',
               contentType: 'application/json; charset=utf-8',



               success: function (r) {
                   //debugger;
                   alert(r.d.val);
                   var RID = r.d.value
                   alert(RID)
                
                   {
                   // }
               }

           });

if i firebug in firefox i can see under the response the correct value
e.g"d: 68"

how do i get that variable into a var?