Ecco uno script su misura...
codice:
<HTML><BODY onLoad="detect();">
<DIV align="center">
[img][/img]</DIV>
<SCRIPT language="Javascript1.2">
<!--
/////Coded by 16437952/////
function detect()
{
switch (navigator.appName)
{
case "Netscape" :
	document.images[0].src="netscape.jpg";
	break;
case "Microsoft Internet Explorer" :
	document.images[0].src="ie.jpg";
	break;
default :
	document.images[0].src="other.jpg";
}
}
//--></SCRIPT></BODY></HTML>