flushing formdata / flushing the client to prevent resubmitting formdata ?

Hi, Is there any way of preventing form-data being resubmitted after hitting F5/refresh in your client? Ofcourse you can create a warkaround by giving a form a random number or something and check if this number has already been submitted in the script that handles the form data, but I'd rather see if there's a way to flush the client as soon as script is run which processes this data. So.. is there some kind of HTTP header which you can send to the client to make sure the data won't get re-submitted after refreshing? Grtz, Jeroen Jeroen Wesbeek Webdevelopper DoWebWeDo St. Jacobsstraat 16 3500 AK Utrecht 030-2348110 [ Roses are red, violets are blue, I am schizophrenic and so am I ] [ If you don't understand it, get rid of it ]