function showEdv() {
    var popup = document.createElement('div');
    popup.setAttribute('id', 'popup');
    var close = document.createElement('img');
    close.setAttribute('id', 'close');
    close.setAttribute('src', 'obr/close.png');
    close.setAttribute('alt', 'zavrit');
    //close.setAttribute('onClick', 'removeEdv()');
    //close.setAttribute('onmouseover', 'redCross()');
    //close.setAttribute('onmouseout', 'normalCross()');
    close.onclick = removeEdv;
    close.onmouseover = redCross;
    close.onmouseout = normalCross;
    document.getElementById('body').appendChild(popup);
    document.getElementById('body').appendChild(close);
    popup.style.width = '380px';
    popup.style.height = '75px';
    
    var w = 0;
    var h = 0;
    //IE
    if(!window.innerWidth) {
        //strict mode
        if(!(document.documentElement.clientWidth == 0)) {
            w = document.documentElement.clientWidth;
            h = document.documentElement.clientHeight;
        } else {
            w = document.body.clientWidth;
            h = document.body.clientHeight;
        }
    } else {
        w = window.innerWidth;
        h = window.innerHeight;
    }
    
    var top = (h / 2) - (document.getElementById('popup').offsetHeight / 2);
    var left = (w / 2) - (document.getElementById('popup').offsetWidth / 2);
    
    
    popup.style.position = 'absolute';
    popup.style.textAlign = 'center';
    popup.style.left = left + 'px';
    popup.style.top = top + 'px';
    popup.style.backgroundColor = '#EAB9DB';
    popup.style.border = 'solid black .1em';
    popup.innerHTML = '<br />Ke <strong>každému</strong> novému prodloužení řas <br/>modeláž nehtů nebo manikúra <strong>Geleration zcela zdarma!!!</strong>';
    close.style.position = 'absolute';
    close.style.top = top + 1 + 'px';
    close.style.left = left + document.getElementById('popup').offsetWidth - 16 + 'px';
    close.style.cursor = 'pointer';
}

function removeEdv() {
    document.getElementById('body').removeChild(document.getElementById('popup'));  
    document.getElementById('body').removeChild(document.getElementById('close'));  
}

function redCross() {
    document.getElementById('close').setAttribute('src', 'obr/closeRed.jpg'); 
}

function normalCross() {
    document.getElementById('close').setAttribute('src', 'obr/close.png'); 
}