General Support: the order that collections are displayed on main page...

i was wondering if there is a way that i can specify the order in which the collections we have setup in plogger can display in a particular order, for instance, we have the collections setup into years, 2004 concerts, 2005 concerts, 2006 concerts, and now since we have added 2007 concerts instead of coming up on top of the 2006 concerts at the top of the page, it shows up at the bottom below the 2004 concerts? please advise the best way to remedy this. i attempted searching through the site but didn't see anything relevant, might have missed something tho

http://www.willietribute.com/photo_galleries/