@urlopen in IE

Helloi’am triying to open a popup window in IE from notes 6 client.

a action button contains the following code

@URLOpen(“javascript:”+urltoopen)

where urltoopen is a field thant contains window.open(‘/maydatabase.nsf/0/77167189B6560452C1256FC4005E63C9?opendocument’');

the problem is the popup is opened in notes client although the default browser is specified “Microsoft Internet Explore” in notes setting

Any idea ?