function getXmlhttpObject()
{
    var xmlhttp = false;
    try {
        xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
    } catch(e) {
        try {
            xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
        } catch(e) {
            xmlhttp = new XMLHttpRequest();
        }
    }
    return xmlhttp;
}


function xcall(url, handler)
{
    var xmlhttp = getXmlhttpObject();
    if (!xmlhttp) {
        return false;
    }
    xmlhttp.open('GET', url);
    xmlhttp.onreadystatechange = function() {
        handler(xmlhttp);
    };
    xmlhttp.send(null)
    return true;
}


function xcallNoHandler(url)
{
    var xmlhttp = getXmlhttpObject();
    if (!xmlhttp) {
        return false;
    }
    xmlhttp.open('GET', url);
    xmlhttp.onreadystatechange = function() {
 //       xhandleAlert(xmlhttp);
    };
    xmlhttp.send(null)
    return true;
}

/**
* test function for getting return from handle calling
*/
function xhandleAlert(xmlhttp) {
    if (xmlhttp.readyState == 4) {
        alert(xmlhttp.responseText);
    }
}


/**
* put result to element
*/
function xhandleResult(xmlhttp, element)
{
    if (xmlhttp.readyState == 4) {
        element.innerHTML = xmlhttp.responseText;
    }
}


/**
* call ajax to get result to element
*/
function xgetResult(url, elementid)
{
    var element = false;
    element = document.getElementById(elementid);
    if (!element) {
        return false;
    }
    element.innerHTML = 'Loading...';

    var xmlhttp = getXmlhttpObject();
    if (!xmlhttp) {
        return false;
    }
    xmlhttp.open('GET', url);
    xmlhttp.onreadystatechange = function() {
        xhandleResult(xmlhttp, element);
    };
    xmlhttp.send(null)
    return true;
}


function xgetResultF(url, elementid)
{
    xgetResult(url, elementid);
}
var ax;

function ajaxCreateHttp(rt)
{
    var xobj;
    try  {
        // Firefox, Opera 8.0+, Safari
        xobj=new XMLHttpRequest();
    } catch (e) {
        // Internet Explorer
        try {
            xobj=new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
              xobj=new ActiveXObject("Microsoft.XMLHTTP");
            }  catch (e) {
               alert("Your browser does not support AJAX!");
               return false;
            }
        }
    }
    if (xobj != null) {
        if (rt != null) return xobj;
        ax = xobj;
    }
}


function ajaxRequest(url, proceeder, params, xobj)
{
    var robj = (xobj) ? xobj : ax;
    robj.open("POST", url, true);
    robj.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");
    robj.onreadystatechange = proceeder;
    robj.send(params);
}


String.prototype.trim = function()
{
    return this.replace(/(^\s*)|(\s*$)/g, "")
};


// muze byt otevreno jen jedno Ajaxove okno
var _mainDiv = null;

function i2_showAjaxEditWindow(width,height,func,lang)
{
    if (_mainDiv) {
        alert('Nejdříve zavřete již otevřené okno');
        return false;
    }

    var argv = arguments;
    var argc = argv.length;
    var params = "";
    var browser = navigator.appName;
    var msie7 = navigator.userAgent.indexOf('MSIE 7');
    var msie8 = navigator.userAgent.indexOf('MSIE 8');
    var winW = pageWidth();
    var winH = pageHeight();
    var isIE = ( (browser == "Microsoft Internet Explorer") || (msie7 != -1) || (msie8 != -1) );

    if (argc>3) {
        for (var i=3;i<argc;i++) {
            params += "&v"+(i-2)+"="+argv[i];
        }
    }

    if (!width) width = 300;
    if (!height) height = 300;

    try {
        _mainDiv = document.createElement("div");
        _mainDiv.setAttribute("id", "i2_ajaxWindowDiv");
        _mainDiv.style.width = width;
        _mainDiv.style.height = height;
        _mainDiv.height = height;
        _mainDiv.style.left = pageWidth()/2 - width/2;
        if (!isIE) {
            _mainDiv.style.top = ( (pageHeight()/2) - (height/2) ) + 'px';
        }
        var offset = document.createElement("div");
        offset.setAttribute("id", "i2_ajaxWindowDivOffset");
        i2_ajaxWindowAddEventButtons(offset);
        var gc = document.createElement("div");
        gc.setAttribute("id", "i2_ajaxWindowGC");
        gc.style.width  = width;
        // 30 je sirka horni listy
        gc.style.height = (height-30);
        var waitplease = 'Nahrává se formulář, prosím čekejte...';
        gc.innerHTML = '<div style="margin-top:'+(height/2-45)+'px;text-align:center;">'+waitplease+'</div>';
        offset.appendChild(gc);
        if (func) i2_ajaxWindowGetContentGC(func, params, lang);
        _mainDiv.appendChild(offset);
    } catch (e) {
        alert('Nepodařilo se otevřít nové okno.');
        alert(e);
        return false
    }
    var body = document.getElementsByTagName("body")[0];
    body.appendChild(_mainDiv);

    return false;
}


function i2_ajaxWindowCalculateTop()
{
    var topScreen = document.documentElement.scrollTop ?
    document.documentElement.scrollTop : document.body.scrollTop;

    var constant = (pageHeight()/2) - (_mainDiv.height/2);

    result = topScreen + constant;

    return result;
}


function i2_ajaxWindowAddEventButtons(offset)
{
    var buttons = document.createElement("div");

    buttons.setAttribute("id", "i2_ajaxWindowButtons");
    buttons.style.width = _mainDiv.style.width;
    buttons.style.height = 30;

    var buttonsIN = document.createElement("div");
    var hr = '<a href="#" onclick="return i2_closeAjaxWindow()"><img src="i2/img/admin/link-delete.gif" /</a>';
    buttonsIN.innerHTML = hr;
    buttons.appendChild(buttonsIN);

    offset.appendChild(buttons);
}


function i2_closeAjaxWindow() {
    var body = document.getElementsByTagName("body")[0].removeChild(_mainDiv);
    _mainDiv = null;
    return false;
}


function i2_ajaxWindowGetContentGC(func, params, lang) {
    i2_ajaxProceedCall(func,i2_ajaxWindowProceedAjax,params,lang);
}


function i2_ajaxWindowProceedAjax() {
    if (ax.readyState == 4) {
        document.getElementById("i2_ajaxWindowGC").innerHTML = ax.responseText;
    }
}


function i2_ajaxProceedCall(phpfunc,jsfunc,phpparams,lang) {
    url = "handle.php?cmd=i2_ajaxProceedCall&func="+phpfunc;
    if (lang) {
        url += '&ln='+lang;
    }
    ajaxCreateHttp();
    ajaxRequest(url,jsfunc,phpparams);
}

function i2_ajaxWaitShow() {
    var id = "#"+i2_getAjaxWaitElement().getAttribute("id");
    //jquery
    $(id).fadeIn("slow");
}


function i2_ajaxWaitHide() {
    var id = "#"+i2_getAjaxWaitElement().getAttribute("id");
    //jquery
    $(id).fadeOut("slow");
}


var ajaxElm = null;
function i2_getAjaxWaitElement() {
    if (ajaxElm) return ajaxElm;

    ajaxElm = document.createElement("div");
    ajaxElm.style.width = pageWidth() + "px";
    ajaxElm.style.height = pageHeight() + "px";
    ajaxElm.style.position = "absolute";
    ajaxElm.style.background = "black";
    ajaxElm.style.display = "none";
    ajaxElm.style.top = "0";
    ajaxElm.style.left = "0";
    ajaxElm.style.zIndex = "9999";
    ajaxElm.style.opacity = "0.7";
    ajaxElm.style.filter = "alpha(opacity=40)";
    ajaxElm.style.textAlign = "center";
    ajaxElm.style.paddingTop = pageHeight()/2-30;
    ajaxElm.setAttribute("id", "i2_awod336");

    ajaxElm.innerHTML = '<div><img src="i2/img/admin/ajaxWaiter.gif" /></div><div></div>'

    document.getElementsByTagName("body")[0].appendChild(ajaxElm);
    return ajaxElm;
}