Jul 3rd, 2015, 1:00 PM
That is definitely do-able with some jQuery, but not straight out of the box with FormTools. I have integrated it into some of my forms that I use with FormTools. Here's an example from someone else:
http://jsfiddle.net/jadendreamer/5SArB/
http://jsfiddle.net/jadendreamer/5SArB/