var ajax_http_request = false;
function load(url, post_parameters) {

	ajax_http_request = false;
	var tf;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		tf = '1';
		ajax_http_request = new XMLHttpRequest();
		if (ajax_http_request.overrideMimeType) {
			ajax_http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE 
		tf = '2';
		try {
			ajax_http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				ajax_http_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {}
	}
	}
	if (!ajax_http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}


	if(tf=='2'){
		ajax_http_request.open('POST', url, true);
	} else {
		ajax_http_request.open('POST', url, false);	
	}

	ajax_http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	ajax_http_request.setRequestHeader("Content-length", post_parameters.length);
	ajax_http_request.setRequestHeader("Connection", "close");
	post_parameters = encodeURI(post_parameters);
	ajax_http_request.send(post_parameters);

	var result = ajax_http_request.responseText;

	if (ajax_http_request.readyState == 4) {
		if (ajax_http_request.status == 200) {
			if(result==''){
				return true;
			} else {
				return result;
			}
		} else {
			alert('Error: Ajax.status = [' + ajax_http_request.status + ']');
			return false;
		}
	} else {
		alert('Error: Ajax.readyState = [' + ajax_http_request.readyState + ']');
		return false;
	}
}