Calling commands from php - xhost access by www-data?

Hi
I have a PHP page on Ubunutu 5.10 and I want it to call the totem DVD
player for me like this:
/usr/bin/totem --fullscreen /dev/dvd/MOVIE
This works fine from the shell
>>From PHP I try to call it like:
$command=@exec("/usr/bin/totem --fullscreen /dev/dvd/MOVIE");

The apache error log says:

Xlib: connection to ":0.0" refused by server

Xlib: No protocol specified

(totem:8226): Gtk-WARNING **: cannot open display:

So I guess I need to allow www-data to open a display - how do I go
about setting that up?
thanks in advance

pr0fess0r

.

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