// HTTP通信用、共通関数
function createXMLHttpRequest(cbFunc){
    var XMLhttpObject = null;
    try{
        XMLhttpObject = new XMLHttpRequest();
    }
    catch(e){
        try{
            XMLhttpObject = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e){
            try{
                XMLhttpObject = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e){
                return null;
            }
        }
    }
    if (XMLhttpObject) XMLhttpObject.onreadystatechange = cbFunc;
    return XMLhttpObject;
}