Réponse acceptée !
bonjour
bien evidement c'est a adapter
<html>
<head>
<script type="text/javascript">
function change(imageaaffiche){
if(imageaaffiche=='invisible'){
document.getElementById('coucou').style.visibility='hidden'
}
else{
document.getElementById('coucou').style.visibility='visible'
document.getElementById('coucou').src=imageaaffiche
}
}
</script>
</head>
<body>
<div style='position:absolute;top:0px;width:500px'>
<span style='display:block;margin-top:50px;'>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br>
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br>
<span>
<div style='position:absolute;top:50px'>
<img id ='coucou' src ='d4g.jpg' style='visibility:hidden'>
<br>
<img src ='d1.jpg'onmouseover="change('d1g.jpg')"onmouseout="change('invisible')">
<img src ='d2.jpg'onmouseover="change('d2g.jpg')"onmouseout="change('invisible')">
<img src ='d3.jpg'onmouseover="change('d3g.jpg')"onmouseout="change('invisible')">
</div>
</div>
</body>
</html>