These are JavaScript tooltips, it isn't some breakthrough technology. Your company won't collapse if the guy disappears. If his stuff is better than the open s

These are JavaScript tooltips, it isn't some breakthrough technology. Your company won't collapse if the guy disappears. If his stuff is better than the open source stuff, go for it. You can always move to the open source code later. And think, by then it might have caught up with him, and you'll only have to update your code once, rather than each step as the open source code catches up (assuming it does).