So, anders:
<html><head><title>Bilder-Dingen</title>
<script type="text/javascript">
<!--
function changePic(Name,toDo)
{
var img = new Image();
img.src = "images/" + Name + ((toDo == "on") ? "h.jpg" : ".jpg");
document.images[Name].src = img.src;
}
//-->
</script>
</head><body>
<a href="index.htm" onmouseover="changePic('Bild','on')" onmouseout="changePic('Bild','off')"><img src="images/Bild.jpg" alt="" name="Bild"></a>
</body></html>
Das kann sogar Netscape 3.
Gruß
Norbert