if ((navigator.userAgent.indexOf('Mac OS X') != -1) && (navigator.userAgent.indexOf('Safari/5') != -1) && (navigator.userAgent.indexOf('Version/4') != -1))
{
  document.write("<link href='/stylesheets/safari4.css' rel='stylesheet' type='text/css' />")
}

if ((navigator.userAgent.indexOf('Mac OS X') != -1) && (navigator.userAgent.indexOf('Firefox/3') != -1))
{
  document.write("<link href='/stylesheets/ff_mac.css' rel='stylesheet' type='text/css' />")
}

if ((navigator.userAgent.indexOf('Mac OS X') != -1) && (navigator.userAgent.indexOf('Firefox/2') != -1))
{
  document.write("<link href='/stylesheets/ff_mac.css' rel='stylesheet' type='text/css' />")
}