ExecCommand CreateLink and IMG

Question

I use webbrowser-control (MSHTML Edit) in design mode. When I try to insert a hyperlink for a selected text it works fine. But when I try to insert a hyperlink for a selected picture I got the error:

Error 100
Function expected

Code:

var
 pCmd : OleVariant;
begin
 html_doc.execCommand('CreateLink', True, pCmd);
end;

How to insert a hyperlink in a picture in another way, different from using execCommand?