is there a File Upload limit 4000bytes...

I have a script for uploading images which seems to stop working after 4000 bytes? using $HTTP_POST_FILES I alway get a 'name' and 'type' but all files bigger than 4000 bytes are returned without tmp_name and size? MAX_FILE_SIZE is 20000000 and all php memory, post_max and upload_max are set to 8M Im very confused and my head hurts from thinking too hard but I have a feeling im going to have to kick myself in the butt ! see for yourself http://213.61.126.228/up.php A give out the $HTTP_POST_FILES in the example... Why me... Thx in advance. Gary