When i hover over the button i want new image to describe that button, but it's blinking [on hold]

When i hover over the button i want new image to describe that button, but
it's blinking [on hold]

I want that when I hover over the button to keep the button on its place
and show a little describe box below. There's no picture in demo, so you
can't see exactly what I am talking about. Here's also a pic how it should
look like. http://i.imgur.com/otfNxJr.jpg Demo: http://jsbin.com/UXAleHi/1