function IsIE8Browser() {
  var browserName=navigator.appName;
  return (browserName=="Microsoft Internet Explorer");
}

function SetupStyle() {
  if (IsIE8Browser()) {
    document.write ("<link href='estiloIE.css' rel='stylesheet' type='text/css'>");
  } else {
    document.write ("<link href='estilo.css' rel='stylesheet' type='text/css'>");
  }
}