With Tooltips you can use a simple syntax to give any piece of text or image a nice and simple tooltip.
You can create these tooltips virtually anywhere in your site. So not only in articles, but also in modules and components.
The syntax simply looks like:
You can use the editor button to place an example tooltip tag.
The styling of the Joomla 2.5 version of Tooltips is based on the tooltips used in the Joomla administrator, with the addition of some CSS3 styles like border radius and a shadow.
The styling Joomla 3 version of Tooltips is based on the Bootstrap popover styling.
But you can of course overrule these styles via css if you want.
More information: http://www.nonumber.nl/tooltips
NoNumber extensions require php 5.3.13+
See for more requirements: http://www.nonumber.nl/tooltips#requirements