is_uploaded_file false if file too big

Hi, I am having a problem with is_uploaded file returning false if the file uploaded is over a certain size. I have used ini_set("upload_max_filesize", "8M"), as well as setting MAX_FILE_SIZE like this: <INPUT TYPE="hidden" name="MAX_FILE_SIZE" value="21000000000000"> (ie real big :) Still, if I try to upload a file over about 2mb, is_uploaded_file returns false and the $userfile var is empty. Shouldn't it report an uploaded file even if it is too large? This is quite annoying as my script uses is_uploaded_file to check if a file has been uploaded, and if not it shows an upload form. If I try to upload a +2Mb file, after a short wait I get the upload form again. Any help in fixing this would be appreciated. Here is my setup: PHP-4.0.5-dev CGI IIS4/NT4 SP4 Regards, Tyson Lloyd Thwaites IT&e Limited e-Commerce Division Adelaide (08) 8346 3888