The HTML:
1 This is the <a class="tooltip" href="#">Tooltip Link<span>This will be the text that shows up in the tooltip</span></a> You can place any text you want here.
The CSS:
1 a.tooltip {position: relative}
2 a.tooltip span {display:none; padding:5px; width:200px;}
3 a:hover {background:#fff;} /*background-color is a must for IE6*/
4 a.tooltip:hover span{display:inline; position:absolute;}