+ @next_by_user = Changeset.find(:first, :order => "id ASC", :conditions => [ "id > :id AND user_id = :user_id", {:id => @changeset.id, :user_id => @changeset.user_id }] )
+ @prev_by_user = Changeset.find(:first, :order => "id DESC", :conditions => [ "id < :id AND user_id = :user_id", {:id => @changeset.id, :user_id => @changeset.user_id }] )