Any Facebook API expert around?

I need some help with my app.

I want to post to one of my pages as the page itself.

I get the list of the access token for the page from

$facebook->api('/me/accounts ', 'GET',
array(
  'access_token' => "tokenhere"
)
);

PHP:

but when I post to the page, it still posts as me, not the page.

What am I doing wrong here?

Thanks.