upload problem with IE

I create a form for uploading file: <table> <tr> <td> <form action="upload.php" method="POST" enctype="multipart/form-data"> nome<input type="text" name="name" size="40" maxlength="100"><br> <input type="hidden" name="MAXFILESIZE" value="10000"> file <input type="file" name="file"><br> <input type="submit" name="subimage" value="insert"> </form> </td> </tr> </table> but in IE 5.0 and 6.0 when I try to save the file from the tmp_dir it say that there is nothing to save, I'm using php4.3.1 and to the function: print_r ($_FILES['file']['tmp_name']); and don't return any information the form pass the variable name : print_r ($_FILES['file']['name']), but not the tmp_name. someone has already find this problem and can help me? It works in Mozilla perfectly, but I need to use IE Thank you very much for your help. Ammo