How to get it to work on multiusersite

It worked for me using it on my own site.
Now however I would like to use it on a multiuser site. It would be very nice to be able to restrict it to choose only the posts from one blog. That is if I go to A's blog the arhcive only gives me A's posts.
I have some blocks where I have restricted them to pick n.uid ='$accountid' but I'm not advanced enough to get that in to a module.