how to know upload progress status

Hello, I'm beginning to use PHP, maybe my question is very simple... Anyway, I want permit users to upload files using a form, and I would show them the upload progress status... I don't know how to extract informations about upload progress status and how to show informations to users. For example I want the users can see 30% of upload completed, or the MByte just uploaded. I had some difficulties to write to the list, so I send the mail (with some modifies in the address) several times; I apologyze if many mails are sended to the list. Thanks for help...! S. In th file "fileupload.php" I call a function named "uploadfile" as shown in the follow code: uploadfile($g_dir_corrente); if (is_uploaded_file($HTTP_POST_FILES['userfile']['tmp_name'])) { $nomefile=$HTTP_POST_FILES['userfile']['name']; if(($nomefile!=".htaccess")&&($nomefile!=".ftpaccess")&&($nomefile!=".quota")) { copy($HTTP_POST_FILES['userfile']['tmp_name'],"$g_dir_corrente/$nomefile"); messaggio(12); // show a message to users echo "<br>"; } else { messaggio(13); // show a message to users } } ************************************************************** function uploadfile($g_dir_corrente) { $Upload_file=messaggioX(11); // show a message to users echo " <form enctype=\"multipart/form-data\" action=\"fileupload.php\" method=\"post\"> <input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"1000000000\"> $Upload_file <input name=\"userfile\" type=\"file\"> <input type=\"submit\" value=\"Upload\"> </form> "; }