<script type="text/javascript">
var http_request = false;
  
function makePOSTRequest(url, parameters) 
{
    http_request = false;
    if (window.XMLHttpRequest) 
    { 
        // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) 
        {
            http_request.overrideMimeType('text/xml');
        }
} 
else if (window.ActiveXObject) 
{ 
    // IE
    try 
    {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
    } 
    catch (e) 
    {
        try 
        {
            http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } 
        catch (e) 
        {
        }
    }
}

if (!http_request) 
{
    alert('Cannot create XMLHTTP instance');
    return false;
}

http_request.onreadystatechange = alertContents;
http_request.open('POST', '&orderby='+parameters, true);
http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
http_request.setRequestHeader("Connection", "close");
http_request.send(parameters);
}

function alertContents() 
{
    if (http_request.readyState == 4) 
    {
        if (http_request.status == 200) 
        {
            result = http_request.responseText;
            var obj = document.getElementById('spResult');
            obj.innerHTML = result;
        }
    }
}

</script> 

makePOSTRequest('order.php', 'date');