Permission to write in other directory

[Euforia]

Hi there,

I have a (private) server running ispCP 1.0.0 RC4 OMEGA build: 20080316. There are serveral websites running on them which i all administrate.

The problem: I want to execute a php file in /var/www/virtual/website.com/htdocs/upload.php which uploads a image to /var/www/virtual/otherwebsite.com/htdocs/picturedir

Logically this gives errors due to suexec and DocumentRoot?

How can i solve this?


Thanks!