Prova questi:

<HTML> <HEAD>
<script language="JAVASCRIPT">
function scambio(imm){
if (document.getElementById)
{document.getElementById('figura').src = imm.href; return false;}
else {return true;}
}
</script>
</HEAD>
<BODY>
<DIV id="quadro">[img]prima.gif[/img]
Cane
Gatto
Topo
</DIV>
</BODY></HTML>


Questo usa VBScript, quindi va solo con IE

<HTML> <HEAD>
</HEAD>
<BODY>
<DIV id="quadro">[img]prima.gif[/img]
<A onMouseOver="cambiafigura(1)">Cane</A>
<A onMouseOver="cambiafigura(2)">Gatto</A>
<A onMouseOver="cambiafigura(3)">Topo</A>
</DIV>



<SCRIPT language="VBScript"><!--
Sub cambiafigura(x)
Select case x
case 1 figura.src="Cane.gif"
case 2 figura.src="Gatto.gif"
case 3 figura.src="Topo.gif"
End Select
End sub
--></SCRIPT> </p>
</BODY></HTML>

Ciao rudyF