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$( function () {

    if( mw.config.get( "wgPageName" ) === "Special:Undelete" &&

            window.location.search.indexOf( "timestamp=" ) >= 0 ) {

        mw.loader.using(  "mediawiki.util" ], function () {

            $( "#bodyContent" ).prepend( $( "<div>" )

                .attr( "id", "contentSub2" )

                .append( "< ", $( "<a>" )

                    .attr( "href", mw.util.getUrl( "Special:Undelete", { target: mw.config.get( "wgRelevantPageName" ) } ) )

                    .text( "All deleted revisions" ) ) );

        } );

    }

} );