File upload maximum execution time error

Hi All, We have web IIS5 (web+ftp)+php4 installed on the same server. It takes about 5-6 min to upload 20MB file to our ftp server. But we cannot upload it through http php upload. I set parameters == upload_max_filesize =40M post_max_size=40M max_execution_time=920 and then set it to zero == but anyway got that error. In some cases explorer displayed me a timeout error. Is there any workaround for this case? FYI, My script handles the upload, creates an html with a body-onLoad-self:close() and a hidden form which posts upload results to a CGI application, which generates all html. Thanks in advance Vladimir