Im planning to visit Zhejiang Province as a tourist. If I do find a job while I am there, is it possible for me to change my L visa into a Z visa in China?

Hi, I am a filipino passport holder, I finished a 1 year job contract in China this March 2011 using a Z visa. Now Im planning to visit Zhejiang Province as a tourist. Will it affect my future employment in China if I ever extend my L visa while Im there? Or if I do find a job while Im there, is it possible for my employer to get me proper work permits?