maitechnology

My problem is : I have result_database, containg 10 tables for student result score, I already generated pin numbers to be used to access thier result online, the will use their registration number, category, and pin number to access it, but I wanted it in such a way that once, a pin is used to access a particular result, that pin should only be recognised for that result, cannot be used for another  student. So I want suitable pin number validation, already student cannot use wrong pin nos. This the link to the page I am working on for clear understanding of the probelm..... umar_albashir: http://www.abubusinessadmin.com/result.htm Any body with an idea?????