/* Request data from TWIG via AJAX/JSON.
 * Copyright (C) 2006  Aaron Stone <aaron@serendipity.cx>

 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

function getDataJSON(name, url, callback)
{
	var req;
	var sendVal = true;
	var sendValue;
	if (window.XMLHttpRequest) { // Mozilla, Safari, ...
		req = new XMLHttpRequest();
		sendValue = null;
	} else if (window.ActiveXObject) { // IE
		try {
			req = new ActiveXObject("Msxml2.XMLHTTP");
			sendVal = false;
		} catch (e) { try {
			req = new ActiveXObject("Microsoft.XMLHTTP");
			sendValue = "";
		} catch (e) {
			req = false;
		} }
	}

	if (req) {
		req.onreadystatechange = function() {
			if (req.readyState == 4 && (req.status == 200 || req.status == 304)) {
				callback(name, req);
			}
		};
		req.open('GET', url);
		if (sendVal)
			req.send(sendValue);
		else
			req.send();
	}
}