Logging In Problem: I'm Using Php And Mysql

Hi,
    I'm not a good programmer at all but i was hoping if someone could help me out with this problem.
Basically, when i put in the username and password for a webpage I'm trying to create, it directs to me localhost/webpa/login_check.php and produces this result

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I'm using php and mysql but I'm having problems logging in. I have attached the code for my login.php and login_check.php. I would really appreciate it if anyone could help me out. thanks