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<?php

function ccd_add_page_break_button( $buttons, $id ){
    if ( 'content' != $id )
        return $buttons;
    array_splice( $buttons, 13, 0, 'wp_page' );
    return $buttons;
}
add_filter( 'mce_buttons', 'ccd_add_page_break_button', 1, 2 );

?>