如何在delphi5中实现对word文档页眉的设置？

我这有一个对当前页面的设置代码

var

mmm,nnn,aaa:OleVariant;

begin

mmm:=wdLine;

nnn:=1;

aaa:=wdFieldPage;

WordApp.ActiveWindow.ActivePane.View.SeekView :=wdSeekCurrentPageHeader ;

WordApp.Selection.Move(mmm,nnn);

WordApp.Selection.ParagraphFormat.Alignment := wdAlignParagraphCenter;

WordApp.Selection.InsertAfter('第');

mmm:=wdCharacter;

WordApp.Selection.Move(mmm,nnn);

WordApp.Selection.Fields.Add(WordApp.Selection.Range,aaa,mmm,nnn);

aaa:=wdFieldNumPages;

WordApp.Selection.InsertAfter('页/第');

WordApp.Selection.Move(mmm,nnn);

WordApp.Selection.Fields.Add(WordApp.Selection.Range,aaa,mmm,nnn);

WordApp.Selection.InsertAfter('页');

WordApp.ActiveWindow.ActivePane.View.SeekView := wdSeekMainDocument;

end;

可是只能修改第一页的，怎么修改后面的页面的页眉？