17th ranked Northern Iowa takes on fifth-ranked Pacific in the semifinal round of the East regional in the N-C-A-A volleyball tournament tomorrow night. U-N-I downed Ball State and Indiana last weeked to advance to the Sweet-16 for the first time in school history. Pacific is 30-2 and is the host team of the regional. U-N-I coach Iradge Ahrabi-Fard says his team has to carry the play at Pacific.The winner meets the winner of Florida-B-Y-U match for the right to advance to the final four.