PHP GD problem--not enough permission to make image?
Error: 

    Warning: imagejpeg() [function.imagejpeg]: Unable to open 'images/xxx/xxx.jpg' for writing: Permission denied in /usr/www/users/xxx/resources/func.createthumbs.php on line 48
    images/xxx/xxx/xxx.jpg
    Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/xxx/resources/updatethumbs.php:17) in /usr/www/users/xxx/resources/func.createthumbs.php on line 3

So... How can I change the permission?  This is being run on a shared server--is it possible?
PHP GD problem--not enough permission to make image?
===

Error: 

    Warning: imagejpeg() [function.imagejpeg]: Unable to open 'images/xxx/xxx.jpg' for writing: Permission denied in /usr/www/users/xxx/resources/func.createthumbs.php on line 48
    images/xxx/xxx/xxx.jpg
    Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/xxx/resources/updatethumbs.php:17) in /usr/www/users/xxx/resources/func.createthumbs.php on line 3

So... How can I change the permission?  This is being run on a shared server--is it possible?