/*
AJAX Library v. 1.0
Copyright (c) 2008 Matt Jacobson.
All rights reserved.

Redistribution and use in source and binary forms, with or without 
modification, are permitted provided that the following conditions 
are met:

1. Redistributions of source code must retain the above copyright 
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright 
notice, this list of conditions and the following disclaimer in the 
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote 
products derived from this software without specific prior written 
permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

// external functions:
// AJAX (url, method, qrystring, ongood, onbad)

function AJAX (url,method,qrystring,ongood,onbad) {
    method = method.toUpperCase();
    if (!(method == "GET" || method == "POST" || method == "HEAD" || method == "TRACE")) {
      
    }
    var req;
    if (window.XMLHttpRequest) { // not IE
        req = new XMLHttpRequest();
        req.onreadystatechange = function() { processReqChange(req,ongood,onbad); };
        req.open(method, url, true);
        if (method == "POST") {
            req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
            req.send(qrystring);
        } else {
            req.send("");
        }
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = function() { processReqChange(req,ongood,onbad); };
            req.open(method, url, true);
            if (method == "POST") {
                req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
                req.send(qrystring);
            } else {
                req.send("");
            }
        }
    }
}

function processReqChange (req, ongood, onbad) {
    if (req.readyState == 4) {
        if (req.status == 200 || req.status == 0) {
            ongood(req);
        } else {
            onbad(req);
        }
    }
}