Linking back to current page

[Shantanu Deo <sh...@elixir-it.com>]

Hi,
  We are using Paypal in our business process, and one of the things that
paypal allows is to specify a return url's, one to return to after a
successful transaction and another to return if he user cancels the
transaction while on PayPal's site.
  My question is what do my pages's which have the PayPal button link have
to implement so I can have the user return back to the same place from where
he initiated the transaction.

Thanks in advance,
SD