Here is an example of expandable This part of the page will only be displayed, if the mouse is moved over the word expandable.
This is a pure CSS solution. Nice. information.

Lets play around with this a bit. Here's more Expandable information can contain anything. Here's an image: and even some more Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! Some long text here! and here is another example Hello :)