function createXMLHttpRequest(cbFunc)
{
    var XMLhttpObject = null;
    if ( window.XMLHttpRequest ) { // Safari,Firefox,IE7
        XMLhttpObject = new XMLHttpRequest();
    } else if ( window.ActiveXObject ) { // IE
        try {
            XMLhttpObject = new ActiveObject("Msxml2.XMLHTTP"); // IE6
        }
        catch(e){
            try {
                XMLhttpObject = new ActiveObject("Microsoft.XMLHTTP"); // IE5
            }
            catch(e){
                return null;
            }
        }
    }
    if (XMLhttpObject) {
        XMLhttpObject.onreadystatechange = cbFunc;
    }
    return XMLhttpObject;
}