var xmlHttp = false;

/**
 * ?????????????????????XMLHttpRequest????????????????????????????????????false
 */
function createXMLHttpRequest() {
	
	
		if (window.ActiveXObject) { //??????MS ActiveX??????XMLHttpRequest
			try {
      // ???????????????InternetExplorer????????????
				xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch (e1) { // ???????????????ActiveX????????????
				try {
        // ???????????????InternetExplorer????????????
					xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
				}
				catch (e2) {
        // ????????????ActiveX??????XMLHttpRequest
				}
			}
		}else
	if (window.XMLHttpRequest) { // ??????IE??????????????????XMLHttpRequest??????
		xmlHttp = new XMLHttpRequest();
	}
	return xmlHttp;
}