(function($){

   $.fn.linkedSelect = function(url,destination,params) {
      var $dest = $(destination);
      return this.each(function(){
         $(this).bind('change', function() { 
            var $$ = $(this);
            $dest.ajaxStart(function(){
                 $$.show();
            });

            $.getJSON(url,{str: $$.val() }, function(j){
               var options = "";
               current_selected_categories = 0;
               if (j.length > 0) {
                  for (var i = 0; i < j.length; i++) {
                     options += '<input type="checkbox" onclick="isLimitReached(this)" style="width:20px" name="primary_areas[]" value="' + j[i].optionValue + '" />' + j[i].optionDisplay+'<div class="spacer"></div>';
                  }
               }
               
               $dest.html(options); 
            });

         });

      });

   };

})(jQuery);