Only Unique numbers in a text field

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Only Unique numbers in a text field

I faced a problem where i the user can enter only unique numbers in a text field in a asp.net page. for example if there are four text fields there should be only unique numbers if all the fields are filled and i enter a duplicate number it will change the other text field with the same number to a different number this javascript code does just that i hope it will be of some help to some one

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