function otevri_obrazek(cislo,sirka,vyska)
{
if (vyska > screen.height){ var odshora = (screen.height-vyska)/4; } else { var odshora = (screen.height-vyska)/2; }
if (sirka > screen.width){ var odleva = (screen.width-sirka)/2; } else { var odleva = (screen.width-sirka)/2; }
window.open("image2.php?num="+cislo,"img","toolbar=no,menubar=no,location=no,directories=no,scrollbars=no,resizable=yes,status=no,width=" + sirka + ",height=" + vyska + ",top="+ odshora +",left="+ odleva);
}