function createREQ(){

try {
	req = new	XMLHttpRequest(); /* 파이어폭스 등의 브라우저 */
	}	catch(err1) {
			try {
			req = new ActiveXObject("Msxml2.XMKHTTP");
	/* IE 일부 버전 */
			}	catch(err2) {
					try {
					req = new ActiveXObject("Microsoft.XMLHTTP");
	/* IE 일부 버전 */
					}	catch(err3) {
							req = false;
						}
				}
		}
		return req;
}


function requestGET(url, query, req) {
	myRand = parseInt(Math.random() * 99999999);
	req.open("GET", url + '?' + query + '&rand=' + myRand, true);
	req.send(null);
}


function requestPOST(url, query, req) {
	req.open("POST", url, true);
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	req.send(query);
}


function doCallback(callback, item) {
	eval(callback + '(item)');
}


function doAjax(url, query, callback, reqtype, getxml) { //XMLHTTPRequest 객체의 인스턴스 생성
	var myreq = createREQ();

	myreq.onreadystatechange = function() {
		if(myreq.readyState == 4) {
			if(myreq.status == 200) {
				var item = myreq.responseText;
				if(getxml == 1) {
					item = myreq.responseXML;
				}
				doCallback(callback, item);
			}
		}
	}
	if(reqtype == 'post') {
		requestPOST(url, query, myreq);
	}
	else {
		requestGET(url, query, myreq);
	}
}