Hy guys, i set up 2 banners 1 to show up today 10/7/2011 and to expire tomorrow 10/8/2011 (sort order 0) and the next one to start on 10/8/2011 and to expire on 10/9/2011 (sort order 1) they work BUT if i refresh the page 1 or 3/4 times the next banner shows up.

What can I do to make a banner today and tomorrow to be another one?