Change jstree node color programmitically

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ASP.NET

webservice

JSON.NET

My jstree bind with following json format comes from web service..i want to change node color programmatically.

$("#divCourseTree").jstree({
                  'core': {
                      'data': {
                          'type': "POST",
                          "async": "true",
                          'contentType': "application/json; charset=utf-8",
                          'url': "../WebService/BranchLocation.asmx/BindCourseTreeData",
                          'data': "{}",
                          'dataType': 'JSON',
                          'data': function (node) {

                           },
                          'success': function (retvel) {
                              var r = [];
                              var data = eval("(" + retvel.d + ")");
                              for (var key in data) {
                                  if (data.hasOwnProperty(key)) {

                                      var y = data[key].id;
                                      r.push(y);
                                      $("#" + y + " a").addClass('.Selected');

                                  }
                              }

                          }

                      }
                    }
                  });