2 week notice contract!!

Facts: Our manual says that the employer/employee may resign without any reason. I have seen 4 people spot fired in the last month and I am getting worried that they may do this to me.
Question: Is there any templates out there that could outline acontract for me that ammends the manual and forces the employer to give 2 weeks notice (of course they would have to sign it), and me give them 2 weeks also.