fix post preview to don't do it if it is turned off

js/interface_common.js

@@ -704,11 +704,13 @@ function replyTextInput(event) {
             }
         }
 
+        if ($.Options.postPreview.val) {
             if (textArea[0].value.length)
                 textAreaForm.find('#post-preview').html(htmlFormatMsg(textArea[0].value, [])).show();
             else
                 textAreaForm.find('#post-preview').html('').hide();
         }
+    }
 
     function getPostSplitingPML() {
         if (splitedPostsCount > 1) {