From what I saw in the HTML it looks as though the non-breaking spaces were added, I'm confused as to why the <br> tags were also added. Why not let the menu conform to the user's screen size?
Replacing &nbsp; with white space should be plenty. If someone is really worried about links wraping on seperate lines why not just wrap each link with more than one word in <nobr> tags? Wouldn't that more accurately give the desired results as well as leave the job of formatting to the screen resolution?

-silent11