Use this Swiss Federal Railway site to get the timetable:
http://www.sbb.ch/index_e.htm
You can take the Thalys to Brussels and trasfer, or the TGV to Lille and transfer. Both about the same total time (2 hours) from Paris-Nord to Gent. The two methods alternate, depending on the hour.
[This message has been edited by rkkwan (edited Jan 12, 2004).]