By contract I am presuming that you are talking about a written agreement that outlines the employee/employer relationship for a specified time (e.g., May 15, 2006 to May 14, 2008).
You really should have an attorney review it in its entirety. A fundamental breach that could result in your dismissal for just cause includes breach of rules/company policy; insolence; disobedience; and, refusal to sign written warnings.
Over a message board we can only give basic responses to questions. No one has copy of your contract.
Use the Find a Lawyer thing to the right to find an employment law/contract attorney in your area.
Again, good luck.