We'll create fresh WordPress site with WordPress Tooltip installed. You have 20 minutes to test the plugin after that site we'll be deleted.
WordPress tooltip plugins lets you add tooltips to plain text and links on your post and pages.
It offers a tinyMCE shortcode GUI which will guide you through the entire process of a tooltip.
This plugin uses jQuery tipTip authored by Drew Wilson http://code.drewwilson.com/entry/tiptip-jquery-plugin.
You can also add tooltips manually by following the pattern below:
[tooltip content="This will show in a tooltip" url="This will make tooltip a link"]Hover over me for tooltip[/tooltip]
Url is optional. If URL is added, it will render a link otherwise it will be a plain text.