My working Visa

I am currently working in Harbin, Heilongjiang as a physics teacher in a university. I have a working visa and a resident visa (it will expire on july 30, 2012). I will go back to the Philippines this July 2012 to have a short summer vacation. I have a job offer in Chong Qing same as my job in Harbin. Will I need to get another working visa in the philippines for me to work in Chong Qing or the school in Chong Qing will just renew my resident visa?. Can you help me with this enquiry. Thank you so much.