Merge pull request jquery#463 from jason-oster/master

Merge jquery#463.

Author: scottgonzalez

ui/jquery.ui.datepicker.js

@@ -799,9 +799,10 @@ $.extend(Datepicker.prototype, {
 		if (this._datepickerShowing) {
 			var showAnim = this._get(inst, 'showAnim');
 			var duration = this._get(inst, 'duration');
+			var self = this;
 			var postProcess = function() {
 				$.datepicker._tidyDialog(inst);
-				this._curInst = null;
+				self._curInst = null;
 			};
 
 			// DEPRECATED: after BC for 1.8.x $.effects[ showAnim ] is not needed