Even in such a case, I would continue to argue that yes, this single question could be made into more than one page. The first one would ask which countries they would like to search in, and then the next page could display checkboxes for each of the regions within each country selected. This may well end up producing many checkboxes on the second page (hopefully too many users aren't willing to work anywhere, ie: selecting all countries), but I think some people would be surprised at the usefulness of this setup.
Having one multi-select field for such information is a hassle as well as a pain. I'd select my options, then scroll up and scroll through the entire list again, making sure that I had held down the control key for every single click. Then I'd find out to my horror that I hit the shift key instead of control, and I now have 20 options selected instead of my 3. Then redo the whole thing over... Okay, now I've been a web user long enough to remember to hold the control key, so I wouldn't have this problem myself, but there are a lot of non-nerds out there who can't seem to do things in just the right way :) You have to be ready for everything!
C:\>shutdown -s
>> Could not shut down computer:
>> Microsoft is logged in remotely.
In reply to Re^4: multi-select html forms
by Coruscate
in thread multi-select html forms
by Anonymous Monk
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