function el(id) { return document.getElementById(id);}

/*
httpGET(url) => false|string(responseText)
httpPOST(url,data) => true|false|string(responseText)

*/

// +--------------------------------------------------------------------+
// | DO NOT REMOVE THIS                                                 |
// +--------------------------------------------------------------------+
// | request.js                                                         |
// | Functions for getting and saving data using XMLHttpRequest object. |
// +--------------------------------------------------------------------+
// | Author:  Cezary Tomczak [www.gosu.pl]                              |
// | Project: SimpleDoc                                                 |
// | URL:     http://gosu.pl/php/simpledoc.html                         |
// | License: GPL                                                       |
// +--------------------------------------------------------------------+

/*
    Note (httpPOST): seems like IE always caches retrieved data until you close the browser,
    so when you call a few times the same url, it always returns the same, even
    if the content in the given url changed. There are 2 solutions: add to url
    some random query string or in the url script send NOCACHE headers.
*/

function Waiting(){
	if(el("feedback")){
		el("feedback").innerHTML = "<span class=\"waiting\">WORKING...</span>";
	}
}	

function Done(){
	if(el("feedback")){
		el("feedback").innerHTML = "";
	}
}

// returns: false|string(responseText)
function httpGET(url) {
    var req;
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.open('GET', url, false);
		req.onreadystatechange = Waiting();
        req.setRequestHeader('Accept-Charset','UTF-8');
        req.setRequestHeader('Connection','close');
        req.send(null);
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.open("GET", url, false);
			req.onreadystatechange = Waiting();
            req.setRequestHeader('Accept-Charset','UTF-8');
            req.setRequestHeader('Connection','close');
            req.send();
        } else {
            alert("Could not create ActiveXObject (XMLHttpRequest)");
            return false;
        }
    } else {
        alert("Your browser does not support XMLHttpRequest object");
        return false;
    }
    if (req.status != 200) {
        alert("There was a problem while retrieving the data:\n" + req.statusText);
        req.abort();
        return false;
    }
    //return req.responseText;
	Done();
    return req.responseText;
}

// returns: true|false|string(responseText)
function httpPOST(url, data) {
	var req;
	var content = data;
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.open('POST', url, false);
		req.onreadystatechange = Waiting();
        req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
        req.send(content);
    } else if (window.ActiveXObject) {
        req = new ActiveXObject('Microsoft.XMLHTTP');
        if (req) {
            req.open('POST', url, false);
			req.onreadystatechange = Waiting();
            req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
            req.send(content);
        } else {
            alert("Could not create ActiveXObject (XMLHttpRequest)");
            return false;
        }
    } else {
        alert("Your browser does not support XMLHttpRequest object");
        return false;
    }
    if (req.status != 200) {
	alert("There was a problem while sending the data:\n" + req.statusText);
        req.abort();
        return false;
    }
	Done();
    if (req.responseText.length) {
        return req.responseText;
    }
    return true;
}