Newbie file upload problem

I'm trying to get some the example files from Thickbooks to work, although I've also tried php.net and PHPBuilder with similar results. I'm dealing with an ISP so I can't view php.ini or change permissions directly. Using the most basic elements of the script I get errors immediately after trying to submit the form which posts the file. The errors vary across browsers. In IE I get "Attempt to load accessing url "http://.../do_upload.php" failed." Netscape gives an error something like "File does not exist." I've asked the ISP to check the permissions on the PHP temp directory and assign PHP the permission to write to my final destination directory. Which they say they have done. Any ideas where to look next? Thanks, Tom >>.>>.>>>.>>>>>.>>>>>>>>> >> >><<<<<<<<<.<<<<<.<<<.<<.<<<.<<<<<< Tom Beidler Orbit Tech Services 805.682.8972 (phone) http://www.orbittechservices.com/ 805.682.5833 (fax) tom@orbittechservices.com >>.>>.>>>.>>>>>.>>>>>>>>> >> >><<<<<<<<<.<<<<<.<<<.<<.<<<.<<<<<<