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//globale Instanz von XMLHttpRequest
var xmlHttp = false;
 
//XMLHttpRequest-Instanz erstellen
//... für Internet Explorer
try {
    xmlHttp  = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
    try {
        xmlHttp  = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
        xmlHttp  = false;
    }
}
//... für Mozilla, Opera, Safari usw.
if (!xmlHttp  && typeof XMLHttpRequest != 'undefined') {
    xmlHttp = new XMLHttpRequest();
}
 
//aktuelle Daten laden
loadData();
 
//alle 5 Sekunden neue Daten holen
setInterval("loadData()",1000);

function loadData()
{
 if (xmlHttp) {
     xmlHttp.open('GET', 'getdata.php', true);
     xmlHttp.onreadystatechange = function () {
         if (xmlHttp.readyState == 4) {
             document.getElementById("chat_box").innerHTML = xmlHttp.responseText;
         }
     };
     xmlHttp.send(null);
 }
}

function saveData()
{
 if (document.chat_form.chat_message.value != "")
 {
  if (xmlHttp) {
     xmlHttp.open('POST', 'setdata.php');
     xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
     xmlHttp.send('message='+document.chat_form.chat_message.value);
  }
 }
 else
 {
  window.alert('Keine Nachricht eingegeben');
 }
 document.chat_form.chat_message.value = '';
 document.chat_form.chat_message.focus();
}