onMouseOver Example
using CSS tooltip

<style>

a.info {
    position:relative;
    z-index:24;
    background-color:#ccc;
    color:#000;
    text-decoration:none
}

a.info:hover {
    z-index:25; 
    background-color:#ff0
}

a.info span { display: none }

a.info:hover span { /*the span will display just on :hover state*/
    display:block;
    position:absolute;
    top:2em;
    left:2em;
    top:2em;
    border:1px solid #0cf;
    background-color:#cff;
    color:#000;
    text-align:left
}

</style>

<SCRIPT>

var displayStatus = "Click here for more information about our Fine Displays";

if (document.images) {
     var displayOn = new Image();
     displayOn.src
= "images/displayOn.gif";
}

function imgOn(imgName) {
     if (
document.images) {
          document[imgName].
src = eval(imgName + "On").src;
         
// OR document[imgName].src = "images/" + imgName + "On.gif";
     }
    
window.status = eval(imgName + "Status");
}

function imgOff(imgName) {
     if (
document.images) {
          document[imgName].
src = eval(imgName + "Off").src;
         
// OR document[imgName].src = "images/" + imgName + "Off.gif";
     }
    
window.status = "";
}

</SCRIPT>

<BODY>

<A CLASS="info" refers to the assignment made within the <style> that gives us the tooltip when we do a mouseover and
<
SPAN>Click here for more information about our Fine Displays</SPAN> is the message within the tooltip

<A CLASS="infoHREF="display.htm"
  onMouseOver="imgOn('display'); return true;"
  onMouseOut="imgOff('display')">
<
SPAN>Click here for more information about our Fine Displays</SPAN>
<
IMG NAME="display" SRC="images/displayOff.gif" ALT="Fine Displays">
</A>