function retrieveStatus() {
    var email = document.getElementById('email').value;
    var orderId = document.getElementById('orderid').value;
    var result = document.getElementById('result');

    xmlHttp = getXmlHttpObj();
    xmlHttp.onreadystatechange = function() {
        if (xmlHttp.readyState == 4) {
    var message = xmlHttp.responseText;
    result.innerHTML = message;
    document.getElementById('showMessage').style.display='none';
        }
    }
    var url = "retrieve_status.php?email="+email+"&orderid="+orderId;
    xmlHttp.open("GET",url,true);
    document.getElementById('showMessage').style.display='block';
    xmlHttp.send(null);
}

function getXmlHttpObj() {
    try {
        xmlHttp = new XMLHttpRequest();
    } catch (e) {
        try {
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {
                alert("Your browser does not support AJAX!");
                return false;
            }
        }
    }
    return xmlHttp;
}