script läuft im IE nicht.

function req(url,div_name,method,post){

    if (!document.getElementById(div_name)) {
        return 0;
    }

    try {
        // Firefox, Opera 8.0+, Safari
        var xmlHttp1=new XMLHttpRequest();
    } catch (e){
        // Internet Explorer
        try {
            xmlHttp1=new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e){
            try {
                xmlHttp1 = new ActiveXObject("Microsoft.XMLHTTP");
            }catch (e){
                alert("Your browser does not support AJAX!");
                return false;
            }
        }
    }
    
    
    xmlHttp1.onreadystatechange = function(){
        
        if(xmlHttp1.readyState==4){
            var content = xmlHttp1.responseText;
            document.getElementById(div_name).innerHTML = content;
        }
    }
    
    xmlHttp1.open(method,url,true);
    xmlHttp1.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlHttp1.send(post);
    
}

function sendShout(e) {
    if (e.keyCode != 13) {
        return false;
    }
    
    if (!document.getElementById("username")) {
        return 0;
    }
    
    var msg = document.getElementById("shoutinput").value;
    var user = document.getElementById("username").value;
    document.getElementById("shoutinput").value = '';
    
    var post = "user=" +user+"&text=" + Base64.encode(msg);

    req("/include/shoutbox.php?ajax=1","shouttext","POST",post);
}

function initbox() {
    var url = "/include/shoutbox.php";
    
    req(url,"shouttext","GET",null);
    s=setTimeout("initbox()",10000);
}

function timer() {
    
        
    if (!document.getElementById("resetbox")) {
        return 0;
    }

    
    req("/include/gettime.php","resetbox","get",null);
    t=setTimeout("timer()",1000);
}

var s=setTimeout("initbox()",500);
var t=setTimeout("timer()",1000);