var Mac=(navigator.userAgent.indexOf("Mac")!=-1);
var Win=(navigator.userAgent.indexOf("Win")!=-1);
var Netscape=(navigator.appName.indexOf("Netscape")!=-1);
var Explorer=(navigator.appName.indexOf("Explorer")!=-1);
var Version=navigator.appVersion.charAt(0);

if
(Explorer && Mac && Version=="4") 
{document.write('<LINK rel="stylesheet" href="css/ie_mac.css" type="text/css"><style type="text/css"><!-- @import url("css/mie5.css") ; --></style>');}

else if
(Mac && Netscape && Version=="4")
{document.write('<LINK rel="stylesheet" href="css/nn_mac.css" type="text/css">');}

else if
(Mac && Netscape && Version=="5")
{document.write('<LINK rel="stylesheet" href="css/nn_mac.css" type="text/css">');}

else if
(Win && Explorer && Version=="4")
{document.write('<LINK rel="stylesheet" href="css/ie_win.css" type="text/css">');}

else if
(Win && Netscape && Version=="5")
{document.write('<LINK rel="stylesheet" href="css/nn_win.css" type="text/css">');}

else if
(Win && Netscape && Version=="4")
{document.write('<LINK rel="stylesheet" href="css/nn_win.css" type="text/css">');}