var nomnav = navigator.appName;
if (nomnav == 'Microsoft Internet Explorer') {
  document.write("<link rel='stylesheet' media='screen' type='text/css' href='/fileadmin/templates/styles/styles_ie.css'>");
}
else {
  document.write("<link rel='stylesheet' media='screen' type='text/css' href='/fileadmin/templates/styles/styles.css'>");
}