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);
function getURL(uri){
if
(Explorer && Mac) 
{document.write('<link rel="stylesheet" href="'+uri+'common/css/mac_ie.css" type="text/css">');}

else if
(Mac && Netscape && (Version >= 5))
{document.write('<link rel="stylesheet" href="'+uri+'common/css/mac_ns.css" type="text/css">');}

else if
(Mac && Netscape && (Version >= 4) && (Version < 5))
{document.write('<link rel="stylesheet" href="'+uri+'common/css/mac_ns4.css" type="text/css">');}

else if
(Win && Explorer)
{document.write('<link rel="stylesheet" href="'+uri+'common/css/win_ie.css" type="text/css">');}

else if
(Win && Netscape && (Version >= 5))
{document.write('<link rel="stylesheet" href="'+uri+'common/css/win_ns.css" type="text/css">');}

else if
(Win && Netscape && (Version >= 4) && (Version < 5))
{document.write('<link rel="stylesheet" href="'+uri+'common/css/win_ns4.css" type="text/css">');}

else
{document.write('<link rel="stylesheet" href="'+uri+'common/css/other.css" type="text/css">');}
}