Fix for issue #628

Author: mlh758

src/jquery.multiselect.js

@@ -406,7 +406,7 @@
       });
 
       // close each widget when clicking on any other element/anywhere else on the page
-      $doc.bind('mousedown.' + this._namespaceID, function(event) {
+      $doc.bind('mousedown.' + self._namespaceID, function(event) {
         var target = event.target;
 
         if(self._isOpen