Disallowing selectbox change

I'm working on a fairly standard drop-down select navigation widget; now
my user wants to add categories to the select, thusly:

-- Category1 --
Page1
Page2
Page3
-- Category2 --
Page4
Page5
Page6

When the page is loaded, the appropriate item is selected.  If a
different "PageN" option is selected, the onchange fires, redirecting
appropriately; if one of the Category option is picked, it doesn't
submit (easily done).  However, if a Category option is selected, it's
possible to then select the original page link, causing the page to
reload.

Is there any way in the onchange handler to disallow the change--so, if
the selected option has no value, the select box returns to the
previously selected option?  Firefox allows me to disable the Category
options entirely, which is nice (and avoids the issue), but IE doesn't.
I thought returning false might do the trick, as that works for form
onsubmits, but no dice.  The only other option I can think of is to
record where the select ought to be, and, if the user tries to pick
something invalid, force the selectedIndex back to the original, but
this feels somewhat kludgy.  Is there a better option I'm not aware of?

Thanks,
-David


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