vedi se funziona

codice:
<html> 
<head> 
<script language="JavaScript"> 
<!-- 
function MM_checkPlugin(plgIn, theURL, altURL, autoGo) { //v4.0 
var ok=false; document.MM_returnValue = false; 
with (navigator) if (appName.indexOf('Microsoft')==-1 || (plugins && plugins.length)) { 
ok=(plugins && plugins[plgIn]); 
} else if (appVersion.indexOf('3.1')==-1) { //not Netscape or Win3.1 
if (plgIn.indexOf("Flash")!=-1 && window.MM_flash!=null) ok=window.MM_flash; 
else if (plgIn.indexOf("Director")!=-1 && window.MM_dir!=null) ok=window.MM_dir; 
else ok=autoGo; } 
if (!ok) theURL=altURL; if (theURL) window.location=theURL; 
} 
//--> 
</script> 
</head> 
<body bgcolor="#FFFFFF" text="#FF9900" onLoad="MM_checkPlugin('Shockwave Flash','index_flash','index_noflash',true);return document.MM_returnValue"> 
<font face="Arial, Helvetica, sans-serif">Checking flash plugin. 
 
Please wait... </font> 
</body> 
</html>