var ua = 0;
var bd = 0;
var ss_dir = '../stylesheets/';

// can we get browser & os info?
if(navigator.userAgent)
  ua = navigator.userAgent.toLowerCase();
if(navigator.appName)
  bd = navigator.appName.toLowerCase();

// if yes,
if(ua){
  document.write("\n");
  // if M$ os,
  if((ua.indexOf("win")!=-1)||(ua.indexOf("windows")!=-1)){
    if(bd.indexOf("netscape")!=-1)
      document.write('<link rel="stylesheet" type="text/css" href="'+ss_dir+'ms_ns.css">');
    else if(bd.indexOf("microsoft")!=-1)
      document.write('<link rel="stylesheet" type="text/css" href="'+ss_dir+'ms_msie.css">');

  // if mac os,
  } else if((ua.indexOf("mac")!=-1)||(ua.indexOf("ppc")!=-1)){
    if(bd.indexOf("netscape")!=-1)
      document.write('<link rel="stylesheet" type="text/css" href="'+ss_dir+'mac_ns.css">');
    else if(bd.indexOf("microsoft")!=-1)
      document.write('<link rel="stylesheet" type="text/css" href="'+ss_dir+'mac_msie.css">');
  }
  document.write("\n");

// if no,
} else {
  document.write('<link rel="stylesheet" type="text/css" href="'+ss_dir+'default.css">');
  document.write("\n");
}