fix

index.php

@@ -359,6 +359,7 @@ if (!empty($_GET["admin"])){
                         $stmt5->bind_param('i', $idcko);
                         $stmt5->execute(); 
                         $stmt5->store_result();
+                        exit();
                     }
                     else{
                         $deleteid = intval(htmlspecialchars($_POST['deletechatmsg']));
@@ -367,6 +368,7 @@ if (!empty($_GET["admin"])){
                             $stmt6->bind_param('ii', $idcko, $deleteid);
                             $stmt6->execute(); 
                             $stmt6->store_result();
+                            exit();
                         }
                     }
                 }

templates/admin.html

@@ -5,9 +5,9 @@
         <script>
           __LOCALIZATION_LANGSELECT_SCRIPT__
           function deleteit(indexik){
-              $.post("index.php?admin=1&delete=1",
+              $.post("index.php?admin=1&deletechatmsg=1",
                 {
-                delete: indexik
+                deletechatmsg: indexik
                 },
                 function(data, status){
                   updateTable();