Hola
Wel
A ver si te sirve esto:
Código HTML:
<html>
<head>
<title>Untitled</title>
<script>
zoom=100;
var tiempo;
function reduce() {
obj=document.getElementById('im');
if(zoom>50) zoom-=10;
obj.style.width=zoom;
obj.style.height=zoom;
tiempo=setTimeout('reduce(im)',1000);
}
function amplia(im) {
obj=document.getElementById('im');
obj.style.width=100;
obj.style.height=100;
zoom=100;
clearTimeout(tiempo)
}
</script>
</head>
<body>
<img id="im" src="/Web/imagen.gif"
onmouseover="reduce()" onmouseout="amplia()" />
</body>
</html>
Saludos,