Hi there Springbok,
and a warm welcome to these forums. 
Here is a CSS example for you to try...
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<base href="http://www.coothead.co.uk/images/">
<meta charset="utf-8">
<title>css "tooltip"</title>
<style>
body {
background-color:#f0f0f0;
}
#container {
width:830px;
padding:5px;
margin:20px auto 0;
border:3px double #666;
box-shadow:#333 20px 20px 40px;
background-color:#fff;
overflow:hidden;
}
.friends {
position:relative;
float:left;
width:401px;
height:246px;
border:2px solid #333;
margin:5px;
cursor:pointer;
}
.friends:nth-of-type(1) {background-image:url(blood.jpg);}
.friends:nth-of-type(2) {background-image:url(grap.jpg);}
.friends:nth-of-type(3) {background-image:url(clouds.jpg);}
.friends:nth-of-type(4) {background-image:url(autumn.jpg);}
.friends span {
position:absolute;
top:-7px;
left:273px;
z-index:1;
display:none;
width:123px;
padding:5px;
border:1px solid #630;
background-color:#fdb;
font-family:verdana,arial,helvetica,sans-serif;
font-size:10px;
color:#630;
box-shadow:#000 1px 1px 2px;
}
.friends:hover span {display:block;}
</style>
</head>
<body>
<div id="container">
<div class="friends">
<span>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque at metus
ac sapien varius vulputate eget vel tellus. Fusce quis diam at mauris vulputate
fermentum sed eu arcu.
</span>
</div>
<div class="friends">
<span>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque at metus
ac sapien varius vulputate eget vel tellus. Fusce quis diam at mauris vulputate
fermentum sed eu arcu.
</span>
</div>
<div class="friends">
<span>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque at metus
ac sapien varius vulputate eget vel tellus. Fusce quis diam at mauris vulputate
fermentum sed eu arcu.
</span>
</div>
<div class="friends">
<span>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque at metus
ac sapien varius vulputate eget vel tellus. Fusce quis diam at mauris vulputate
fermentum sed eu arcu.
</span>
</div>
</div>
</body>
</html>
coothead
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