var navVer = navigator.appVersion;
if(navVer.substr(0,3) >= 4)
if((navigator.appName=="Netscape") && (parseInt(navigator.appVersion)==4)) 
{document.write('<' + 'script language="JavaScript" type="text/javascript" src="/menu/nsmenu.js"><\/script\>');}
else
{document.write('<' + 'script language="JavaScript" type="text/javascript" src="/menu/iemenu.js"><\/script\>');}