Law / Is it possible to work with the same work permit on a different jobs in Poland? [24]

I am from West africa and i m in poland for work.I come here with a work permit valid until 2018 with the name of my company.My contract with my employer is stopped .Now i am looking for job.I just want to know if it is possible to work with the same permit?and how long it takes before getting a new one?thanks