How to automatic fill out HTML forms with TWebBrowser

function FillForm(WebBrowser: TWebBrowser; FieldName: string; Value: string): Boolean;
var
  i, j: Integer;
  FormItem: Variant;
begin
  Result := False;
  //no form on document
  if WebBrowser.OleObject.Document.all.tags('FORM').Length = 0 then
  begin
    Exit;
  end;
  //count forms on document
  for I := 0 to WebBrowser.OleObject.Document.forms.Length - 1 do
  begin
    FormItem := WebBrowser.OleObject.Document.forms.Item(I);
    for j := 0 to FormItem.Length - 1 do
    begin
      try
        //when the fieldname is found, try to fill out
        if FormItem.Item(j).Name = FieldName then
        begin
          FormItem.Item(j).Value := Value;
          Result := True;
        end;
      except
        Exit;
      end;
    end;
  end;
end;


//When the document is complete try to fill out the field homepage with the url
procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject;
  const pDisp: IDispatch; var URL: OleVariant);
begin
  if FillForm(WebBrowser1, 'homepage', 'http://www.swissdelphicenter.ch') = False then
    ShowMessage('Error. Field not available or no Form found.');
end;

// Show the Webbrowser-Progress in Label1
procedure TForm1.WebBrowser1ProgressChange(Sender: TObject; Progress, ProgressMax: Integer);
begin
  if ProgressMax = 0 then
  begin
    label1.Caption := '';
    Exit;
  end;
  try
    if (Progress <> -1) and (Progress < = ProgressMax) then
      label1.Caption := IntToStr((Progress * 100) div ProgressMax) + '% loaded...'
    else
      label1.Caption := '';
  except
    on EDivByZero do Exit;
  end;
end;

//For example you can load the page /en/addtip.php to the TWebBrowser
//When the document is Complete the form where you can put your homepage
//address is filled out
procedure TForm1.Button1Click(Sender: TObject);
begin
  Webbrowser1.Navigate('http://www.swissdelphicenter.ch/en/addtip.php');
  // Show the Titel of the currently active Webpage in the titlebar

  Caption := Webbrowser1.OleObject.Document.Title;
end;