function showhide(id, imgId)
{
img = document.getElementById(imgId);
if (document.getElementById(id).style.margin < "0")
  {
    img.src = 'images/ikony/opened.png';
    createCookie(id,0,365);
  }
else
  {
    img.src = 'images/ikony/closed.png'
    createCookie(id,1,365);
  }
}

function hide(id) {
document.getElementById(id).style.display = 'none';
}