WordPress MU

Which Wordpress function displays or returns all post IDs of all media attachments within a certain blog? Or if there isn't one, can anyone help me find a combination of functions which would do these? Ideally I want to retrieve all media attachments for a specific blog, so I'd want my argument/parameter to be the blog id and the return to be an array/object of the details of the attachment or at least the attachment/post id.

Any piece of advice would be highly appreciated, thanks!

Regarding the return, I meant an array of arrays/objects or attachment/post ids.

Post attachments are saved in the database as post, but with a type of "attachment". Can't remember the field name off the top of my head, but if you look in the wp_X_posts table, and compare an actual post to a post attachment, it's pretty clear.

So then your pseudo-SQL statement would be something like

SELECT blog_id WHERE post_type IS 'attachment'

thanks andrea, I actually found this out a few hours after I posted this but I forgot. For anyone who might need it, here is what I used:

`global $wpdb;
if(!is_numeric($blog_id)) {
$blog_id = web_get_blog_id($blog_id);
}
$wpdb->set_blog_id($blog_id, 1);

$args = array(
'post_type' => 'attachment',
'post_mime_tyupe' => 'image'
);

if( !$attachments = get_children($args) ) {
return false;
} else {
return $attachments;
}`