Vote or Poll Script in ASP with AJAX

<%
Option Explicit
Session.CodePage=65001
Response.Charset="UTF-8"
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="author" content="Roderick Divilbiss">
<meta name="copyright" content="© 2005-2010 Roderick Divilbiss">
<meta name="MSSmartTagsPreventParsing" content="TRUE">
<title>ASP And JavaScript Poll</title>
<script type="text/javascript">
//<![CDATA[

// Does this browser support try-catch?
var tc = false;
try {
    tc = true;
} catch(f) { }

var xmlHttpError = 'XML HTTP Request: OK';

function getRequestObject() {
    var objRequest;
    if (window.ActiveXObject) {
        if (tc) {
            try {
                objRequest = new ActiveXObject('Msxml2.XMLHTTP');
            }
            catch(e) {
                try {
                    objRequest = new ActiveXObject('Microsoft.XMLHTTP');
                }
                catch(f) { } 
            }
        } else {
            objRequest = new ActiveXObject('Microsoft.XMLHTTP');
        }
    } else if (window.XMLHttpRequest) {
        objRequest = new XMLHttpRequest();
        if (objRequest.overrideMimeType) {
            objRequest.overrideMimeType('text/html');
        } 
    }
    return objRequest;
}

function doVote(oButton) {
    document.getElementById('voteform').style.display='none';
    document.getElementById('waiting').style.display='inline';
    document.getElementById('results').style.display='none';
    var vote = oButton.value; // yes or no
    var parameters = 'vote=' + vote;

    var objRequest = getRequestObject();

    if (typeof(objRequest)=='object') {
        if (objRequest.readyState>=0) {
            objRequest.onreadystatechange = function() { handleHttpResponse(objRequest, 'results'); };
            objRequest.open('POST', 'poll_vote_ajax_asp_dovote.asp', true);
            objRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            objRequest.setRequestHeader("Content-length", parameters.length);
            objRequest.setRequestHeader("Connection", "close");
            objRequest.send(parameters);
        }else{
            xmlHttpError = 'XML HTTP Request Object Unavailable';
            return false;
        } 
    }else{
        xmlHttpError = 'XML HTTP Request Object Not Supported';
        return false;
    }
}

function handleHttpResponse(pObjRequest, pElementId) {
    if (pObjRequest.readyState==4) {
        if (pObjRequest.status==200) {
            document.getElementById('voteform').style.display='none';
            document.getElementById('waiting').style.display='none';
            document.getElementById('results').style.display='inline';
            var votes = pObjRequest.responseText.split(',');
            var tmp = votes[0].split('=');
            var yeses = parseInt(tmp[1]);
            tmp = votes[1].split('=');
            var nos = parseInt(tmp[1]);

            var yp = Math.round((yeses / (yeses + nos)) * 100);
            var yn = Math.round((nos / (yeses + nos)) * 100);

            var barchart = '<span>Do people Like broccoli</span><br>';
            barchart += '<div class="votes"><div class="chart"><img border="0" src="images/1x15navy.gif" width="'+yp+'" height="15"></div>Yes: '+yp+'%</div>';
            barchart += '<div class="votes"><div class="chart"><img border="0" src="images/1x15navy.gif" width="'+yn+'" height="15"></div>No: '+yn+'%</div>';
            document.getElementById(pElementId).innerHTML=barchart;
            pObjRequest=null;
        }
    }
}
//-->
</script>
<style type="text/css">
<!--
#waiting, #results {
    display:none;
}

.votes {
    width: 200px;
    height: 15px;
    margin-bottom:3px;
}
.chart {
    float:right;
    width: 100px;
    height: 15px;
    border:1px solid navy;
}
-->
</style>
</head>

<body>
<div id="topmenu"><!--#include file="topMenu.htm"--></div>
<div id="banner"><!--#include virtual="include/banner.htm"--></div>
<div id="mainmenu"><!--#include file="mainMenu.htm"--></div>
<noscript><p>You need JavaScript to view this example.</p></noscript>
<div><h2>How can you record user&#39;s votes on a subject then show the results?</h2></div>
<div class="breaker">Use an ASP post handler page, an AJAX post to that, and build a dynamic JavaScript bar chart of Results<br></div>
<div id="theExample">
  <p id="voteform">Do you like broccoli?&nbsp; <input type="button" value="Yes" name="yes" onclick="doVote(this);"> <input type="button" value="No " name="no" onclick="doVote(this);"></p>
  <p id="waiting"><img border="0" src="images/ajaxCallChangeImage_wait.gif"></p>
  <div id="results"><img border="0" src="images/1x15navy.gif" width="1" height="15"></div>
</div>
<div id="pageCopyright"><!--#include virtual="include/copyright.htm"--></div>
<div id="legal"><!--#include virtual="include/legal.htm"--></div>
</body>

</html>