(function ($) {
  $.fn.selectChain = function (options) {
    var defaults = {
      key: "id",
      value: "label"
    };
        
    var settings = $.extend({}, defaults, options);
        
    if (!(settings.target instanceof $)) settings.target = $(settings.target);
        
    return this.each(function () {
      var $$ = $(this);
            
      $$.change(function () {
        var data = null;
        if (typeof settings.data == 'string') {
          data = settings.data + '&' + this.name + '=' + $$.val();
        } else if (typeof settings.data == 'object') {
          data = settings.data;
          data[this.name] = $$.val();
        }
                
        settings.target.empty();
                
        $.ajax({
          url: settings.url,
          data: data,
          type: (settings.type || 'get'),
          dataType: 'json',
          success: function (j) {
            var options = [], i = 0, o = null;
                        
            for (i = 0; i < j.length; i++) {
              // required to get around IE bug (http://support.microsoft.com/?scid=kb%3Ben-us%3B276228)
              o = document.createElement("OPTION");
              o.value = typeof j[i] == 'object' ? j[i][settings.key] : j[i];
              o.text = typeof j[i] == 'object' ? j[i][settings.value] : j[i];
              settings.target.get(0).options[i] = o;
            }

            // hand control back to browser for a moment
            setTimeout(function () {
              settings.target
              .find('option:first')
              .attr('selected', 'selected')
              .parent('select')
              .trigger('change');
            }, 0);
          },
          error: function (xhr, desc, er) {
            // add whatever debug you want here.
            // alert("an error occurred");
          }
        });
      });
    });
  };
})(jQuery);