Can't use copy() to copy files

["Ben Stones" <stonesben@xxxxxxxxxxxxxx>]

Ok, here is my code (mind it is a bit messy I was just testing to see if it
works first of without success):

if($_GET['act'] == "update") {
  $check_exists=file_exists($_GET['file']);
  if($check_exists==1) {
   if(copy($_GET['file'],$_GET['file'])) {
    echo 5;
   }
   else {
    echo $_GET['file'];
   }
  }
 }

Obviously it doesn't echo 5, it just echo's the file name which is a sign it
isn't copying. If I change it to: copy($_GET['file'],"Hello/".$_GET['file'])
it copies file, and sure enough I check the directory to find it has copied
too. This code is in a seperate directory and I have changed both that
directory, the Hello directory and the file being copied to 777 permissions
but no luck. I noticed the following in the error_log:

[14-Oct-2008 18:07:38] PHP Warning:  copy(/index.php) [<a
href='function.copy'>function.copy</a>]: failed to open stream: Permission
denied in /home/vinat/public_html/Files/test.php on line 31
Any help appreciated!