//非同期通信オブジェクト作成
function createHttpRequest() {
	var	httpRequest = null;
	if (window.XMLHttpRequest) {
		httpRequest = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		try {
			httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) {
			}
		}
	}
	return httpRequest;
}