function check_browser() {
 if (navigator.appName.indexOf("Microsoft") != -1) {
  return 0;
 }
 else if (navigator.appName == "Netscape") {
  if (navigator.appVersion.indexOf("3.") != -1 ) return 3;
  if (navigator.appVersion.indexOf("4.") != -1 ) return 4;
  if (navigator.appVersion.indexOf("5.") != -1 ) return 5;
  if (navigator.appVersion.indexOf("6.") != -1 ) return 6;
 }
  return 99;
}
 
var browser = check_browser();
 
if((browser == 0) || (browser >=5)) {  // Für Microsoft, Opera und Netscape Version 5(6) etc.
 document.write("<LINK rel='stylesheet' href='css/mittelhessen_de_ms.css' type='text/css'>");
}
else if((browser >= 1) && (browser <= 4)) {   // Für Netscape Versionen 1 - 4.
 document.write("<LINK rel='stylesheet' href='css/mittelhessen_de_ns.css'' type='text/css'>");
}