Ligtweight Tooltips With Prototype: CoolTips

CoolTips is an object-oriented, unobtrusive & lightweight class based on Prototype JS + script.aculo.us frameworks for creating good looking tooltips.

It doesn't need any inline JavaScript coding. Using the title attribute of elements is enough and CoolTips will convert them.

The tooltips can be customized using a bunch of parameters or by CSS:

Besides the colors of background, borders & text, it is possible to set the opacity, appear/hide durations or enabling/disabling mouse follow effect.