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Can someone please explain to me why the following code works perfectly in Firefox but fails in Internet Explorer?

function getXMLHttpRequest () {
    try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {};
    try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {};
    try { return new XMLHttpRequest(); } catch(e) {};
    return null;
    }

// Make the XMLHttpRequest object
var http = getXMLHttpRequest();

function sendRequest(Mode, Event, CardNumber)
        {
// Call PHP script for requests
/*  For debug purposes */
document.getElementById("loadingNode").value = "Calling TI3SGM-3.php";
         http.open('get', 'TI3SGM-3.php?EventID='+Event+'&MemberNum='+CardNumber);
         http.onreadystatechange = handleClientDataResponse;
         }

function handleClientDataResponse()
    {
//	document.getElementById("loadingNode").value = "Ons wag vir 'n wenner";

    if(http.readyState == 4 && http.status == 200)
        {
        // Text returned from the PHP script
        var response = http.responseText;
        if(response)
            {
            // UPDATE ajaxResponse content
            var parts = response.split("|");
            var MemberName = document.getElementById("MemberName");
            if (!MemberName)
                {
                alert("We have a problem!");
                }
//            alert(response);
            document.getElementById("CNumber").innerHTML = parts[0];
            document.getElementById("MemberName").innerHTML = parts[1];
            var SlotsValue=parseInt(parts[2],10);
            if (isNaN(SlotsValue)) SlotsValue=0;
            document.getElementById("SlotsValue").innerHTML = SlotsValue;
            var SlotsTurnover=parseInt(parts[3],10);
            if (isNaN(SlotsTurnover)) SlotsTurnover = 0;
            document.getElementById("SlotsTurnover").innerHTML = SlotsTurnover;
            var SlotsIssued=parseInt(parts[4],10);
            if (isNaN(SlotsIssued)) SlotsIssued = 0;
            document.getElementById("SlotsIssued").innerHTML = SlotsIssued;

            var TablesValue=parseInt(parts[5],10);
            if (isNaN(TablesValue)) TablesValue = 0;
            document.getElementById("TablesValue").innerHTML = TablesValue;
            var TablesTurnover=parseInt(parts[6],10);
            if (isNaN(TablesTurnover)) TablesTurnover = 0;
            document.getElementById("TablesTurnover").innerHTML = TablesTurnover;
            var TablesIssued=parseInt(parts[7],10);
            if (isNaN(TablesIssued)) TablesIssued = 0;
            document.getElementById("TablesIssued").innerHTML = TablesIssued;

            document.getElementById("Earned").innerHTML = SlotsValue+TablesValue;

            var BonusValue=parseInt(parts[8],10);
            if (isNaN(BonusValue)) BonusValue = 0;
            document.getElementById("BonusValue").innerHTML = BonusValue;
            var BonusIssued=parseInt(parts[9],10);
            if (isNaN(BonusIssued)) BonusIssued = 0;
            document.getElementById("BonusIssued").innerHTML = BonusIssued;

            document.getElementById("Total").innerHTML=SlotsValue+TablesValue+BonusValue;
            var IssuedValue=parseInt(parts[10],10);
            if (isNaN(IssuedValue)) IssuedValue = 0;
            IssuedValue = SlotsIssued+TablesIssued+BonusIssued;
            document.getElementById("IssuedValue").innerHTML = IssuedValue;
            var TotalValue=SlotsValue+TablesValue+BonusValue;
            var OutstandingValue=TotalValue-IssuedValue;
            document.getElementById("OutstandingValue").innerHTML = OutstandingValue;
		var MayIssue=parseInt(parts[11],10);
            if ((OutstandingValue > 0) && (MayIssue == 1))
                {
                document.getElementById("Issue").disabled=false;
                document.getElementById("Issue").src = 'images/issue.png';
                }
            document.getElementById("loadingNode").value = "";
//            document.getElementById("ajaxResponse").value = response;
//            confirm(parts[0]);
            }
        }
        else if (http.readyState < 4)
            {
//            document.getElementById("loadingNode").value = "Loading........";
		ShowAjaxStatus(http.readyState);
}
function ShowAjaxStatus(What)
{
document.getElementById("loadingNode").value = "Ons wag";
if(What == 0)
	{
	document.getElementById("loadingNode").value = "Uninitialized........";
	}
else
if(What == 1)
	{
	document.getElementById("loadingNode").value = "Loading........";
	}
else
if(What == 2)
	{
	document.getElementById("loadingNode").value = "Loaded........";
	}
else
if(What == 3)
	{
	document.getElementById("loadingNode").value = "Interactive........";
	}
}

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