diff --git a/sortedm2m/static/sortedm2m/widget.js b/sortedm2m/static/sortedm2m/widget.js
index 7f92e2c..dfb631f 100644
--- a/sortedm2m/static/sortedm2m/widget.js
+++ b/sortedm2m/static/sortedm2m/widget.js
@@ -103,6 +103,12 @@
             text = text.replace(/&/g, '&');
             return text;
         }
+        
+        function windowname_to_id(text) {
+            text = text.replace(/__dot__/g, '.');
+            text = text.replace(/__dash__/g, '-');
+            return text;
+        }
 
         if (window.showAddAnotherPopup) {
             var django_dismissAddAnotherPopup = window[dismissPopupFnName];