function tutorial(){
  //erstellen des requests
  var req = null;

  try {
    req = new XMLHttpRequest();
  }

  catch (ms){
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (nonms){
      try{
        req = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (failed){
        req = null;
      }
    }
  }

  //anfrage erstellen (GET, url ist localhost,
  //request ist asynchron
  str1 = document.myForm.X.value;
  str2 = document.myForm.Y.value;
  req.open("GET", 'tutorial.php?x='+str1+'&y='+str2, true);

  //Beim abschliessen des request wird diese Funktion ausgeführt
  req.onreadystatechange = function(){
    switch(req.readyState) {
      case 4:
        if(req.status!=200) {
//                                alert("Fehler: TEST "+req.status);
        }else{
                                //schreibe die antwort in den div container mit der id content
//                                document.getElementById('ajaxback').innerHTML = 'Gespeichert!!!<br><strong>'+
//                                                                        req.responseText
//                                                                        +'</strong>';
        }
        break;
      default:
        return false;
        break;
    }
  };

  req.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  req.send(null);
}





function AJAXchat(){
  //erstellen des requests
  var req = null;

  try {
    req = new XMLHttpRequest();
  }

  catch (ms){
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (nonms){
      try{
        req = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (failed){
        req = null;
      }
    }
  }

  //anfrage erstellen (GET, url ist localhost,
  //request ist asynchron
  req.open("GET", 'chat.php', true);

  //Beim abschliessen des request wird diese Funktion ausgeführt
  req.onreadystatechange = function(){
    switch(req.readyState) {
      case 4:
        if(req.status!=200) {
//                                alert("Fehler: TEST "+req.status);
        }else{
                                //schreibe die antwort in den div container mit der id content
                                document.getElementById('ajaxchat').innerHTML = req.responseText;
        }
        break;
      default:
        return false;
        break;
    }
  };

  req.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  req.send(null);
}