Hi teo,

trace the requests sent by the browser to answer the following question:

> Is there anything in the URL or
> the posted data that could be a counter or transaction identifier which 
you
> have to update?

You can use a packet sniffer or a proxy with logging option
to get the requests sent by the browser. You can also scan
the form page visually for any differences between the first
and second upload when using the browser.

hope that helps,
  Roland


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