My Daughter And Bad words!?

I'm 18 And i Have a 2 yr old daughter and she uses bad words i don't Cuss around my kids at all but My husbad does! She Will Be Startin School in August of 2008 And i don't Want her goin to Preschool Use Words! If She keeps Doin it My 7 month old Twins are gunna end up cussin! Can Some plz tell me how to stop Her With out in her! or Makin Her Feel Bad?