[PHP] disabling the "back" button

[Saquib Farooq]

Hi all,
        can anybody tell how do i disable the user's "back" button, i mean
that when he clicks the back button, in his browser, AFTER he has sigend
out or finished a transaction, he will get a message saying that the 
session has expired ... just the way hotmail does it.
thanx in advance.
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   Saquib Farooq Malik
   [EMAIL PROTECTED]
   [EMAIL PROTECTED]
   Sustainable Develpment
   Network Program (SDNP)
   Tel: 2270684

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