var http_request = false;
function ajax(url, postData) {
	if (window.XMLHttpRequest) { // Mozilla, Safari, Opera ...
    	http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
        	http_request.overrideMimeType('text/xml');
        }
	} else if (window.ActiveXObject) { // IE
    	http_request = new ActiveXObject("Microsoft.XMLHTTP");
	}
	if (!http_request) {
        return false;
    } else {
	}
	http_request.onreadystatechange = resultEncoding;
    http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
    http_request.send(postData);
}

function resultEncoding() {
	if (http_request.readyState == 4) {
    	if (http_request.status == 200) {
        	document.getElementById('ajaxResult').innerHTML = http_request.responseText;
        }
   	}
}