Plain Code

<script>
       $(function() {
               $.ajaxSetup ({ cache: false });
               var ajaxLoadingImg = '<img
src='${Url.Content("/content")}/img/ui/icons/spinner1.gif' />';

               $("#select1").attr("disabled", "disabled");

               //Multiple select option cloning
               $('#add').click(function() {
                       return !$('#select1 option:selected').remove().appendTo('#select2');
               });
               $('#remove').click(function() {
                       return !$('#select2 option:selected').remove().appendTo('#select1');
               });


               //Autocomplete
               $("#instrument").autocomplete("/RegulatorSet/InstrumentSearchAutocomplete", {
                       delay: 150,                             // millisecond delay after keyup/down event
                       minChars: 2,                            // min no of chars to activate
                       mustMatch: false,
                       max: 100,                               // max no of items
                       dataType: 'json',
                       parse: function(json) {
                               var resultList = new Array();

                               $("#instrument").after('<span class="ajax-load">' + ajaxLoadingImg
+ 'Loading Insrument Group' + '</span>');
                               var optionsHtml = '';
                               for(var i=0; i<json.length; i++){
                                       optionsHtml += '<option value="' + json[i].optionValue + '">' +
json[i].optionDisplay + '</option>';
                               }
                               $("#select1").removeAttr("disabled");
                               $("span.ajax-load").remove();
                               $("#select1").html(optionsHtml);

                               return resultList;
                       },
                       formatItem: function(resultList){
                               // No ul required
                       }
               });

       });
</script>