Making Attributes Manditory?

[KES99]

Actually, I've never seen a dropdown anywhere that allowed multiple selections at the same time. If you know of one, a link to see it would be interesting.

Multiple select dropdown is standard HTML see:

http://myuminfo.umanitoba.ca/help.asp?eve=2&fid=124

Your solution

checkboxes with some verification code that would (optionally) require at least one selection before adding to cart

would be the best however there is no way in Zen to do that without ammending the code.......