Try this: {{html clean="false"}} <fieldset> <input type="hidden" name="classname" value="XWiki.XWikiComments" /> <textarea name="XWiki.XWikiComments_comment" rows="5" cols="80"></textarea> <input type="submit" name="action_objectadd" value="Send comment"/> </fieldset> {{/html}}

The trick is the name of the submit button. action_objectadd instructs the server to ignore the action specified in the URL where the form was submitted, and instead to use the action that's specified after the "action_" part, in this case "objectadd". This special form parameter gets submitted only when clicking the "Send comment" button.