Students may be filling the classes at Southern Illinois University in Carbondale, but not everyone in the room is filled with excitement.  Many of the school's faculty members are working without a contract.  Negotiations between the university's administration and several unions have spilled over from last year.   NTTFA President Anita Stoner says they've had two bargaining sessions since mid-July and another is scheduled next week.  Stoner says most of those represented by her union have been given one semester contracts but they're concerned about layoffs and appointments beyond that point.  Other faculty members have gone more than 400 days without a contract.  University's chancellor Rita Cheng says she hopes to see a resolution soon.