function getxmlhttp()
{
    var xmlhttp=false;
    try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } 
    catch (e) { xmlhttp = false; }

    if (!xmlhttp)
        try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } 
        catch (e) { xmlhttp = false; }
        
    if (!xmlhttp && typeof XMLHttpRequest != 'undefined') 
        try { xmlhttp = new XMLHttpRequest(); } 
        catch (e) { xmlhttp = false; }
        
    return xmlhttp;
}

function GetDealerCount(page, vehicle_intid, postcodeId, divId) 
{
    var postcode = document.getElementById(postcodeId).value;
    var url = page + "?" + "postcode=" + postcode + "&" + "vehicle_intid=" + vehicle_intid;

    var xmlhttp = getxmlhttp();
    xmlhttp.open("POST", url, true);
    xmlhttp.onreadystatechange=function() {
        var elem = document.getElementById(divId);
        
        if (xmlhttp.readyState==1 && elem.innerHTML != '') 
        {
            elem.innerHTML = 'Loading..';
        }

        if (xmlhttp.readyState==4) {
            elem.innerHTML = xmlhttp.responseText;
        }
    }
    xmlhttp.send('');
}