How do I make the dropdown become a dropup?

[c0ncise]

Is this possible to do? Thanks!

[caseynix]

You can modify the styles for the .atcb-list selector. Replace top: 100% with bottom: 100% and you'll be good to go. This assumes you have a custom ATC stylesheet on your server. If not, checkout "How to customize style" under the "Style" tab on http://addtocalendar.com/ for steps to set up custom styles.