How to open a save-as dialog and then redirect after donwload?

I want to create the following: 1- A screen a series files and associated buttons 2- if the user clicks the button a "File | save as" dialog opens up 3- after the file the user is redirected to a new page I've gotten 1 and 2 to work but I can't figure out how to do anything after the file has finished downloading. I've tried header("Location: ") but that doesn't work because it must be used before any input is sent. The reason I want this functionality is that once a file is downloaded I want the screen with the buttons to refresh itself and remove the downloaded file from the list displayed to the user. How can I accomplish this? All suggestions welcomed! Jean-Christian Imbeault