get the Selected Objects in a TWebbrowser?

get the Selected Objects in a TWebbrowser? procedure TForm1.Button1Click(Sender: TObject);
begin
if Webbrowser1.OleObject.Document.Selection.type = 'Control' then
begin
if Webbrowser1.OleObject.Document.Selection.CreateRange.CommonParentElement.tagName =
'IMAGE' then
ShowMessage('An Image is selected');
end
else
begin
if Webbrowser1.OleObject.Document.Selection.createRange.Text = '' then
ShowMessage('Nothing is selected - ');
end;
end;