Site update: Countdowns enhancement

I’ve enhanced the PHP class that powers the little box over towards the top of the left column of the home page, Countdowns, with a new field, TIPS, to allow for text that pops up in a little yellow box when you position your mouse over the text when the event is linked to another web page. Even updated the PHP Classes package for those interested in using it themselves, woot! (Code is available under the BSD license.)