Problem in Updating passwords in PHP-MySQL

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http://www.daniweb.com – Hii I m using PHP-MySQL to make a class assignment. In this i have made a login control. It was working very fine. But i made an attempt to provide the password changing facility. Since then my project is not logging in. It shows in table the new password but neither with new password nor with od password it logs me on.. Please help me in this.. (General)