renew my tourist visa dubai in dubai

by REZKALLAH AZEDINE AKRAM
(ALGERIA)

Hi I am an Algerian young man I have a tourist visa to Dubai delivered 16/08/2010 and valid
until :14/10/2010 entry permit number:43311013/2010/204. I want to know if I can renew
my visa during my visit in Dubai and what is the procedure to realize that? thank you for
your help .