function popup2 (szerokosc,wysokosc,zawartosc,klasa) {

        var div_x = (screen.width-szerokosc)/2;
        var div_y = (screen.height-wysokosc)/2;
        
         var newdiv = document.createElement('div');

         newdiv.setAttribute('id','popup');
         newdiv.className=klasa;
         newdiv.style.width = szerokosc;
         newdiv.style.height = wysokosc;
         newdiv.style.left = div_x;
         newdiv.style.top = div_y-100;
         newdiv.innerHTML = zawartosc;
         document.body.appendChild(newdiv);


//alert("x: " + div_x + "y: " + div_y);
}

function popup (szerokosc,wysokosc,zawartosc) {
        
        var div_x = (screen.width-szerokosc)/2;
        var div_y = ((screen.height-wysokosc)/2)-100;
        
        window.open(''+zawartosc+'','popup','width='+szerokosc+',height='+wysokosc+',top='+div_y+',left='+div_x).focus();
        
}