wadi

Hi, How can i pass a query string (get method) so the user cannot see it and edit it in the url? For example blabla.php?infothatisonlysupposedtobeseenbyuserid=1. I don't want the user to be able to see the info about another user. (for example) I have a bunch of links displayed on a page with each another query string. I know about post arrays, i don't want to use forms though. Is it possible with php or is this possible with ajax? Help would be appreciated. Thanks.