Display text or an image to your users when they hover their mouse pointer over an item, without clicking it, by using Tooltips. When a user moves their pointer to text, or an image, for which you have defined a tooltip, a small "hover box" appears. This box can contain text or an image. Optionally the text can contain html formatting including URLs.
Tooltips Pro v4.7.1 - Add Tooltips In Joomla