function otevriOkno(url, jmeno, w, h) {  
  popupWin = window.open(url, jmeno, 'resizable=1,menubar=0,scrollbars=yes,width=' + w + ',height=' + h);
}

function nastavOkno() {
    imgx = document.img.width;
    imgy = document.img.height;
    if(document.img.width > 984)  { imgx = 1024; } else { imgx += 20; }
    if(document.img.height > 723) { imgy = 768; }  else { imgy += 90; }
    window.resizeTo(imgx, imgy)
}