Piloter Internet Explorer par OLE

uses comobj;

procedure OpenIE(aURL: string);
var
IE : Variant;
WinHanlde : HWnd;

begin
if (VarIsEmpty(IE) ) then
begin
IE := CreateOleObject('InternetExplorer.Application');
IE.Visible := true;
IE.Navigate(aURL);
end
else
begin
WinHanlde := FindWIndow('IEFrame', nil);
if (0 <> WinHanlde) then
begin
IE.Navigate(aURL);
SetForegroundWindow(WinHanlde);
end
else
ShowMessage('Can''t open IE !');
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
OpenIE('http://www.swissdelphicenter.ch');
end;