function CallAjax(method , url_string ,wait_flag , send_data, func) {
	var ajax = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		ajax = new XMLHttpRequest();
		if (ajax.overrideMimeType) {
			ajax.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			ajax = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				ajax = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!ajax) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	ajax.open(method , url_string , wait_flag );
	ajax.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	ajax.send(send_data);
	//ajax.setRequestHeader("Content-length", send_data.length);
	//ajax.setRequestHeader("Connection", "close");

	ajax.onreadystatechange = function()
	{
		if( (ajax.readyState == 4) && (ajax.status == 200)){
			func(ajax.responseText,ajax);
			delete ajax;
		}
	}
}