// HTTP通信用、共通関数
function createXMLHttpRequest(cbFunc)
{
	var XMLhttpObject = null;

	if ( navigator.userAgent.indexOf("MSIE") != -1 ){	// IEなら
		try{
			XMLhttpObject = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e){
			try{
				XMLhttpObject = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e){
				return null;
			}
		}
	}
	else{	// IE以外なら
		try{
			XMLhttpObject = new XMLHttpRequest();
		}
		catch(e){
			return null;
		}
	}
	if (XMLhttpObject) XMLhttpObject.onreadystatechange = cbFunc;
	return XMLhttpObject;
}