function getAjaxObject() {
	if ( window.ActiveXObject ) {
		return new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		return new XMLHttpRequest();
	}
}

var ajax = getAjaxObject();

function sendAjaxRequest(url, params, callback) {
	ajax.open("POST", url, true);
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');		
//	ajax.setRequestHeader('Ajax-Request', 'DolphinWeb');		
	ajax.onreadystatechange = callback;
	ajax.send(params);
}

function sendSjaxRequest(url, params) {
	ajax.open("POST", url, false);
	ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');		
//	ajax.setRequestHeader('Ajax-Request', 'DolphinWeb');		
	ajax.send(params);
	return ajax.responseText;
}