diff --git a/templates/2k11/admin/entries.tpl b/templates/2k11/admin/entries.tpl
index 6c6a323d..0fd8ab26 100644
--- a/templates/2k11/admin/entries.tpl
+++ b/templates/2k11/admin/entries.tpl
@@ -88,7 +88,7 @@
             <a class="button_link" href="?serendipity[action]=admin&amp;serendipity[adminModule]=entries&amp;serendipity[adminAction]=delete&amp;serendipity[id]={$entry_vars.entry.id}&amp;{$entry_vars.urlToken}" title="{$CONST.DELETE}"><span class="icon-trash" aria-hidden="true"></span><span class="visuallyhidden"> {$CONST.DELETE}</span></a>
         {/if}
         <input class="entry_preview" type="submit" value="{$CONST.PREVIEW}">
-        <input type="submit" value="{$CONST.SAVE}">
+        <input type="submit" onclick="return serendipity.checkSave();" value="{$CONST.SAVE}">
     </div>
 
     <div id="edit_entry_metadata" class="clearfix">
@@ -170,4 +170,4 @@
         {$wysiwyg_block_item|emit_htmlarea_code:$wysiwyg_block_jsname}
     {/foreach}
     {$entry_vars.wysiwyg_blocks|serendipity_refhookPlugin:'backend_wysiwyg_finish'}
-{/if}
\ No newline at end of file
+{/if}
diff --git a/templates/2k11/admin/serendipity_editor.js.tpl b/templates/2k11/admin/serendipity_editor.js.tpl
index 84561805..dfa8a7a4 100644
--- a/templates/2k11/admin/serendipity_editor.js.tpl
+++ b/templates/2k11/admin/serendipity_editor.js.tpl
@@ -659,11 +659,29 @@
         }
     }
 
-    // ..?
+    // check that the entry is validated for saving, used mainly by serendipity_event_entrycheck
     serendipity.checkSave = function() {
         {serendipity_hookPlugin hook='backend_entry_checkSave' hookAll='true'}
         return true;
     }
+    
+    // set a category to checked
+    serendipity.enableCategory = function(catNumber) {
+        $("#" + "serendipity_category_" + catNumber).prop("checked", true);
+    }
+
+    // is no category enabled?
+    serendipity.hasNoCategoryEnabled = function() {
+        var $source = $('#edit_entry_category');
+        var $selected = $source.find('input:checkbox:checked');
+
+        if ($selected.length > 0) {
+            return false;
+        }
+        else {
+            return true;
+        }
+    }
 
     // save in which directory the first uploaded files is stored (the default when only inserting one file)
     serendipity.rememberUploadOptions = function() {
@@ -1805,4 +1823,4 @@ serendipity_imageSelector_done = function(textarea) {
 
 serendipity_imageSelector_addToElement = function(str, id) {
     return serendipity.serendipity_imageSelector_addToElement(str, id);
-}
\ No newline at end of file
+}