if ((navigator.appName.indexOf("Netscape") != -1) && (navigator.appVersion < "5")) 
{
document.write("<link rel='StyleSheet' href='/stylesheetns6.css' type='text/css'>");
} 
else if ( (navigator.appName.indexOf("Netscape") != -1) && (navigator.appVersion >= "5") ) 
{
document.write("<link rel='StyleSheet' href='/stylesheetns6.css' type='text/css'>");
}
else {
document.write("<link rel='StyleSheet' href='/stylesheet.css' type='text/css'>");
}