function detectMacXFF() {
  var userAgent = navigator.userAgent.toLowerCase();
  if (userAgent.indexOf('mac') != -1 && userAgent.indexOf('firefox')!=-1) {
    return true;
  }
}
  var d = detectMacXFF(); //note new detectMacXFF2 script above
  if (d) {
  document.write("<style>#ul_NavBar li a, #ul_NavBar li a:visited {padding:10px 10px 9px 10px;} #ul_NavBar li.First a, #ul_NavBar li.First a:visited {padding:10px 14px 9px 14px;} #ul_NavBar li.Last a, #ul_NavBar li.Last a:visited {padding:10px 17px 9px 17px;}#ul_NavBar li ul.Doctors {margin:0 0 0 -74px;} #ul_NavBar li ul.Profiles {margin:0 0 0 -149px;} #ul_NavBar li ul.Hospitals {margin:0 0 0 -284px;} #ul_NavBar li ul.Facilities {margin:0 0 0 -366px;} #ul_NavBar li ul.Resources {margin:0 0 0 -445px;}#ul_NavBar li ul.Sponsorship {margin:0 0 0 -635px;}#ul_NavBar li ul.Careers {margin:0 0 0 -68px;}</style>");
 }