ToolTip is also an important part of the website. It makes website more user friendly. If users are given tips on various part of the website, it also helps them in understanding website. Tooltips are used to display some additional information about a link or image when we take our mouse pointer over the link or image. You can also put this with the help of title but it lacks styling. So adding a custom tooltip to the website links is abtter idea.
Additional Reading: Beautiful image free Tool tip with CSS
Read: tooltips script free download
This is a collection of CSS3 ToolTips tutorials:
This is a nice collection of CSS3 ToolTips tutorials. Each tutorial has a demo and download link. You can see the working part of the tutorial from the demo. You can also download the script for and free to use it in your web applications.