Input A Randomly Alpha (letters) In A Specific Field

what i want to do is to put 2 fields in my table , username and password

what iwant to do is to create a page that ask you to unter your username only ,and when u click submit the other page will add new record for the username u enter and will input a randomly alpha(letters and numbers) to yr password field , so how can do this random thing throw the asp"!?!

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