update throttle

@@ -61,7 +61,7 @@
 // the `Cowboy` namespace. Usage will be exactly the same, but instead of
 // $.method() or jQuery.method(), you'll need to use Cowboy.method().
 
-(function(window, $) {
+(function($) {
     '$:nomunge'; // Used by YUI compressor.
 
     // Since jQuery really isn't required for this plugin, use `jQuery` as the
@@ -249,4 +249,4 @@
             : jq_throttle(delay, callback, at_begin !== false);
     };
 
-})(this, jQuery);
+})(jQuery);