Use this template to create a popup window that is displayed when the mouse
is over part of the page. This template has two parameters:

- `mouseover` - This is the text or other content that triggers the
popup.
- `popup` - This should be the content of the popup window. It can be
anything, even images or a whole little wiki page, but should not be too
large for good usability.

Note that browsers that do not support the CSS will display the popup
inline in the page, inside square brackets.

[[!templatebody <<ENDBODY
<TMPL_VAR mouseover>
[<TMPL_VAR popup>]

ENDBODY]]
