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var XMLHTTP_UNITIALISED = 0;var XMLHTTP_LOADING = 1;var XMLHTTP_LOADED = 2;var XMLHTTP_INTERACTIVE = 3;var XMLHTTP_COMPLETED = 4;var giTimerId = null;var giTimerId2 = null;function AjaxObject(){    var self = this;    this.oXMLHttp = this.getXMLHttpRequest();    this.bHasBeenInteractive = false;    this.fCallBack = null;        this.oXMLHttp.onreadystatechange = function()    {        self.handleReadyStateChange();    };}AjaxObject.prototype.handleReadyStateChange = function(){    /*     * Author: Chris Miles     * Name: handleReadyStatusChange     * Purpose: Called when the status of the XMLHttpRequest object's state changes.     * Params: none     * Returns: none     */        if((this.oXMLHttp.readyState === XMLHTTP_INTERACTIVE))    {        this.bHasBeenInteractive = true;    }    if((this.oXMLHttp.readyState === XMLHTTP_COMPLETED))    {        if(this.bHasBeenInteractive === true)        {            this.fCallBack(this.oXMLHttp.responseText);        }        else        {            alert("request completed but, never went through the correct stages");        }    }}AjaxObject.prototype.getXMLHttpRequest = function(){    /*     * Author: Chris Miles     * Name: getXMLHttpRequest     * Purpose: Gets a XMLHTTP Object for the current browser.     * Params: none     * Returns: oXMLHttp - Object - XMLHTTP object     */        var oXMLHttp = null;    if(typeof XMLHttpRequest !== "undefined")    {        oXMLHttp = new XMLHttpRequest();    }    else    {        try        {            oXMLHttp = new ActiveXObject("Msxml2.XMLHTTP");        }        catch(oException)        {            try            {                oXMLHttp = new ActiveXObject("Microsoft.XMLHTTP");            }            catch(oException)            {                alert("Error creating oXMLHttp");            }        }    }    return oXMLHttp;}function startAjaxRequest(){    if(giTimerId !== null)    {        clearTimeout(giTimerId);    }        var oDate = new Date();    ajaxRequest("/sandbox/test.php?time=" + oDate.getTime(), processAjaxResponse);    //giTimerId = setTimeout("startAjaxRequest();", 1000);}function processAjaxResponse(sReponseText){    document.getElementById("output").innerHTML += "timer 1: " + sReponseText + "<br>\n";}function startAjaxRequest2(){    if(giTimerId2 !== null)    {        clearTimeout(giTimerId2);    }        var oDate = new Date();    ajaxRequest("/sandbox/test.php?time=" + oDate.getTime(), processAjaxResponse2);    //giTimerId2 = setTimeout("startAjaxRequest2();", 2000);}function processAjaxResponse2(sReponseText){    document.getElementById("output2").innerHTML += "timer 2: " + sReponseText + "<br>\n";}function ajaxRequest(sURL, fCallBack){    /*     * Author: Chris Miles     * Name: ajaxRequest     * Purpose: starts a AJAX request.     * Params: sURL - String - URL to fetch     *         fCallBack - Function - address of function to be executed                           upon completion of request.     * Returns: none     */        // need a clean way of creating new objects and cleaning them up    // possible a global area gaRequests[gaRequests.length] = request;        var oAjaxObj = new AjaxObject();        oAjaxObj.fCallBack = fCallBack;    oAjaxObj.oXMLHttp.open("GET", sURL, true);    oAjaxObj.oXMLHttp.send(null);}