IE8 double poster i Ajax script

<!-- START HERFRA -->

        <div id="content">
            <p id="chatwindow"> </p>
            <div style="position:absolute;bottom:0;>
            <input id="chatnick" type="hidden" size="11" maxlength="9" value="<?php echo $user->data['username'];?>">
            <input id="chatmsg" type="text" size="30" maxlength="65"  onmouseover="chatmsg.focus();" onclick="chatmsg.focus();" onkeyup="keyup(event.keyCode);return ismaxlength(this);">
            <input type="button" value="Skriv!" onclick="submit_msg();" style="cursor:pointer;border:1px solid gray;">
            </div>
<!--            <textarea id="chatwindow" rows="19" cols="95" readonly></textarea><br>
-->
        </div>

<script type="text/javascript">
function ismaxlength(obj){
var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : ""
if (obj.getAttribute && obj.value.length>mlength)
obj.value=obj.value.substring(0,mlength)

if (obj.value.length>=mlength){
obj.style.backgroundColor="yellow";
}

if (obj.value.length<mlength){
obj.style.backgroundColor="white";
}

}
</script>

<script type="text/javascript">

document.oncontextmenu = function(){return false}
if(document.layers) {
    window.captureEvents(Event.MOUSEDOWN);
    window.onmousedown = function(e){
        if(e.target==document)return false;
    }
}
else {
    document.onmousedown = function(){return false}
}

/* Settings you might want to define */
    var waittime=1200;

/* Internal Variables & Stuff */
    //chatmsg.focus()
    document.getElementById("chatwindow").innerHTML = "Henter data<br /><img src=/images/progress.gif>";

    var xmlhttp = false;
    var xmlhttp2 = false;


/* Request for Reading the Chat Content */
function ajax_read(url) {
    if(window.XMLHttpRequest){
        xmlhttp=new XMLHttpRequest();
        if(xmlhttp.overrideMimeType){
            xmlhttp.overrideMimeType('text/xml');
        }
    } else if(window.ActiveXObject){
        try{
            xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            try{
                xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
            } catch(e){
            }
        }
    }

    if(!xmlhttp) {
        alert('Giving up :( Cannot create an XMLHTTP instance');
        return false;
    }

    xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState==4) {
        document.getElementById("chatwindow").innerHTML = xmlhttp.responseText;

        zeit = new Date();
        ms = (zeit.getHours() * 24 * 60 * 1000) + (zeit.getMinutes() * 60 * 1000) + (zeit.getSeconds() * 1000) + zeit.getMilliseconds();
        intUpdate = setTimeout("ajax_read('/viffertalk/chat.txt?x=" + ms + "')", waittime)
        }
    }

    xmlhttp.open('GET',url,true);
    xmlhttp.send(null);
}

/* Request for Writing the Message */
function ajax_write(url){
    if(window.XMLHttpRequest){
        xmlhttp2=new XMLHttpRequest();
        if(xmlhttp2.overrideMimeType){
            xmlhttp2.overrideMimeType('text/xml');
        }
    } else if(window.ActiveXObject){
        try{
            xmlhttp2=new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            try{
                xmlhttp2=new ActiveXObject("Microsoft.XMLHTTP");
            } catch(e){
            }
        }
    }

    if(!xmlhttp2) {
        alert('Giving up :( Cannot create an XMLHTTP instance');
        return false;
    }

    xmlhttp2.open('GET',url,true);
    xmlhttp2.send(null);
}

/* Submit the Message */
function submit_msg(){
    nick = document.getElementById("chatnick").value;
    msg = document.getElementById("chatmsg").value;

    if (nick == "") {
        check = prompt("please enter username:");
        if (check === null) return 0;
        if (check == "") check = "anonymous";
        document.getElementById("chatnick").value = check;
        nick = check;
    }

    document.getElementById("chatmsg").value = "";
    ajax_write("chatscript.php?m=" + msg + "&n=" + nick)
}

/* Check if Enter is pressed */
function keyup(arg1) {
    if (arg1 == 13) submit_msg();
}

/* Start the Requests! ;) */
var intUpdate = setTimeout("ajax_read('chatindhold.txt')", waittime);

</script>

<ole>

Det er næppe dén kode, der er skyld i dobbelt posting. Prøv at lægge et link til siden

/mvh
</bole>