Hover Over pop up that displays text

Question

I need some suggestions on what I can use for a text pop up that appears when mouse is hovered over certain text.
I have researched many webpages but nothing that I am looking for to be more specific,
I have a table with headers at the top.
I want people to hover over the heading and get a pop up with the definition of the header.
I have currently something working and its kind of simple.
What I was also wondering if there was a way to have the definitions read from a different place?
The definitions will be read from different pages, if I keep it the way that appears now I will have to change the definitions in many pages instead of one centralized place.
Not sure if this makes sense.

Answer 1

It's called a tooltip. One of my favorites is the one in the Jquery ui toolkit.

http://jqueryui.com/tooltip/

Best regards.

Answer 2

最简单的方法是使用默认的HTML工具提示（div标记的title属性）

<div title="My tooltip text">Header</div>