function showAjax(URLstr,str,ctrl) { 
    xmlHttp=GetXmlHttpObject();
    if (xmlHttp==null) {
        alert ("Your browser does not support AJAX!");
        return;
        } 
    var url=URLstr;
    url=url+"?q="+str;
    url=url+"&sid="+Math.random();

    xmlHttp.onreadystatechange=function() {
        if (xmlHttp.readyState==4) { 
            document.getElementById(ctrl).innerHTML=xmlHttp.responseText;
        }
    }
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
}

//not used
function stateChanged(ctrl) { 
    if (xmlHttp.readyState==4) { 
        document.getElementById("mainBox").innerHTML=xmlHttp.responseText;
    }
}

function GetXmlHttpObject() {
    var xmlHttp=null;
    try {
        // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest(); }
            catch (e) {
            // Internet Explorer
            try {
                xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
            }
        catch (e) {
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
}