bName = navigator.appName;
bVer = parseInt(navigator.appVersion); 

if  (bName == "Microsoft Internet Explorer") ver = "good";
else if  (navigator.platform == "MacPPC" && bName == "Microsoft Internet Explorer") ver = "good";
else if  (navigator.platform == "MacPPC" && bName == "Netscape" && bVer == 5) ver = "good";
else ver = "bad";
     
if (ver == "bad") 
{document.write('<script src="qtvr_script_ns.js" language="JavaScript"></script>');}

if (ver == "good") 
{document.write('<script src="qtvr_script_ie.js" language="JavaScript"></script>');}