diff --git a/FO/js/site.js b/FO/js/site.js
index 007821e..44f4922 100644
--- a/FO/js/site.js
+++ b/FO/js/site.js
@@ -1,7 +1,7 @@
 $(window).on("keydown", function (e) {
-    //if (e.keyCode == 116 || e.keyCode == 123) {
-    //    prv(); return false;
-    //}
+    if (e.keyCode == 116 || e.keyCode == 123) {
+        prv(); return false;
+    }
     if (e.keyCode == 119 && typeof (save) == "function" && $("#layermessage:visible").length < 1) {
         save();
     }