Help Need in PHP File Upload

Hi: I need to upload a file during form submittion, I had done all the coding on my local Linux box It work fine over here. When i moved the code to my Client machine File upload is not working well. Server side code first check where file upload is successful by is_uploaded_file($HTTP_POST_FILES['file']['tmp_name']) method, if it is True it will copy it to the destination folder. Once i hosted this code on my clients machine First attempt will work successfully, it will copy the file into the destnation folder. But when i tries to repeat the form submission process, from second time onwards unsuccessful. I am programmatically creating new folder each time so there is no chance of over writing issues. Whe i checked the code more care fully, Function is_uploaded_file($HTTP_POST_FILES['file']['tmp_name']) returns False I am quite new to Linux env. Is it due to some sought of permission issue? Or due to Version problem. I am using Php4.0.3 on my local Linux Box and 4.2.3 on Clients machine. I also tested this code on window's Apache/php4.2.3 It works fine over windows . If anybody can point out the error will be a great Help for me.. Thanks in advance Prad __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com