Image upload problem

// Path to user files relative to the document root.
$Config['UserFilesPath'] = 'http://'.$_SERVER['HTTP_HOST'].'/' ;

// Fill the following value it you prefer to specify the absolute path for the
// user files directory. Useful if you are using a virtual directory, symbolic
// link or alias. Examples: 'C:\\MySite\\userfiles\\' or '/root/mysite/userfiles/'.
// Attention: The above 'UserFilesPath' must point to the same directory.
$Config['UserFilesAbsolutePath'] = $_SERVER['DOCUMENT_ROOT'].'/' ;

$Config['FileTypesPath']['Image']      = $Config['UserFilesPath'] . 'images/' ;
$Config['FileTypesAbsolutePath']['Image']= ($Config['UserFilesAbsolutePath'] == '') ? '' : $Config['UserFilesAbsolutePath'].'images/' ;
$Config['QuickUploadPath']['Image']         = $Config['FileTypesPath']['Image'] ;
$Config['QuickUploadAbsolutePath']['Image'] = $Config['FileTypesAbsolutePath']['Image'] ;