MediaWiki:Gadget-NamespaceNotice.js

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/* Show a notice inside <div id="contentSub"></div> on pages in the Talk namespace */
if ( ( mw.config.get( 'wgNamespaceNumber' ) == 1 ) &&
     ( mw.config.get( 'wgAction') == 'view' ) &&
     ( mw.config.get( 'wgUserName' ) == null ) ) {
  var text = $.getJSON(
        wgScriptPath + '/api.php?',
        {
            action: 'parse',
            prop: 'text',
            page: 'Template:Contribute',
            format: 'json'
        },
        function( data ) {
            if ( data ) {
                var text = data.parse.text['*'];
                $('#contentSub').html(text).css({'margin':'1em 0', 'color':'#000'});
            }
        }
  )
}