Kanske en början?
<head>
<script type="text/javascript">
var y=15;
var z=150;
function zoomopen(name){
var obj=document.getElementById(name).style;
obj.height= y +'px';
if(y < 150) { y = y + 10; }else{y=15;return false;}
setTimeout("zoomopen('"+name+"')", 100);
};
function zoomclose(name){
var obj=document.getElementById(name).style;
obj.height= z +'px';
if(z > 15) { z = z - 10; }else{z=150;return false;}
setTimeout("zoomclose('"+name+"')", 100);
};
</script>
</head>
<body>
<div id="div" onmouseover="zoomopen(this.id)" onmouseout="zoomclose(this.id)" style="position: absolute;border:1px solid #999; top:150px; left:100px; background:snow; width:300px; height:auto;"></div>
</body>

