well, I know you can release more than one egg in a cycle, but not sure that you ovulate two separate times within one cycle. that being said, it made me curious enough to look it up. I found this website, that says 'no' :
http://pregnancy.lovetoknow.com/wiki/Can_You_Ovulate_Twice_in_One_Cycle
and this website that says 'yes, it is possible':
http://www.newscientist.com/article/dn3927-women-can-ovulate-more-than-once-a-month.html