This is a free extension.
Supported Browsers on Desktop clients:
Firefox (from 4.0)
Internet Explorer (From Version 7)
***** NEW: V1.0.3
This maintenance release improves compatibility with PHP 5.4
If you are a css developer you can reprogram whole tooltip through css, no javascipt or php knowledge required.
Installation and utilization is easy and fast.
If you use html inside your "tip=" make sure you do not have blank space between tags, and everything works.
I hope that the dev will continue to develop this plugin.