Table structure of my-favorites table?

and a my-5-latest-viewed table.

would this be sufficient:

tbl_favs
-------------
id user_id user_favorites

Code (markup):

user_favorites as an array (serialize) of advert_ids

for the 5 latest viewed adverts i

tbl_latest_viewed
--------------
id session_id latest_viewed_adverts

Code (markup):

latest_viewed_adverts as an array (serialize) of advert_ids

Only thing is i don't know how to get the latest viewed? Based on a cookie/session and when an user visits an advert add to tbl_latest_viewed. But how to handle fifo (first in first out)??