forms and files

Hi, I have a form kinda like this: <form action=$PHP_SELF?option=Mass&action=add method=POST enctype=multipart/form-data> <input type=file name=passcodeFile> the rest of the form is there too. And $PHP_SELF is set to $PHP_SELF = $_SERVER[PHP_SELF] at the top of the page. When I select a passcodeFile file to upload and click the "upload" button, I am presented with this on the next page: "You need to specify a file to use." Here's what I did: if ($_POST[passcodeFile] == "") { print "You need to specify a file to use."; } Any ideas why it does that even if I do select a file? Thanks, tyler