WebBrowser访问带Frame的网页出错(100分)

//i:=Webbrowser1.OleObject.Document.Frames.Length;
//showmessage(inttostr(i));
RichEdit1.Lines.Add(webbrowser1.oleobject.document.documentelement.document.frames.item(1).document.documentelement.innerText);
我用上面这句访问Frame的网页出错：exception class EOLeException with message'Access is denied'.
我可以保证该网页有2个Frame的，而且我访问别的网页就不会出错。请问各位是怎么回事啊？

用memo的assign

procedure TForm1:WorkOnFrame(doc: IHTMLDocument2);
var
framewin2:IHtmlWindow2;
frameCol:IHtmlFramesCollection2;
i:Integer;
vi:OleVariant;
Frame: IDispatch;

begin
frameCol:=doc.Frames;
for i:=0 to frameCol.Length-1 do
begin
vi:=i;
frame:=frameCol.Item(vi);
frame.QueryInterface(IID_IHTMLWindow2,framewin2);
//richedit1.lines.add...
WorkOnFrame(framewin2.document);
end;
end;