Hi,
I believe, as you only want to do this to one link, not them all, you need to do this from Admin, Speed Bar Management.
For the link you need to open in a new window, in the Url section add the following...
" target=_blank
so for example if you wanted Home to open in a new window,
home.php
would become
home.php" target=_blank
Hope that helps, let me know if not.
Paul Dodman
e-business consultant
Lumino Internet
luminointernet.co.uk