function obr_win (a_obr, a_name, a_prop, a_sirka, a_vyska)
{
	o_sirka = screen.width;
	o_vyska = screen.height;

	a_leva = (o_sirka - a_sirka) / 2
	a_horni = (o_vyska - a_vyska) / 2

	o_prop = ',width=' + a_sirka + ',height=' + a_vyska + ',left=' + a_leva + ',top=' + a_horni

	if (a_prop = "") 
	{
		a_prop = 'toolbar=0,scrollbars=1,status=0,menubar=0,resizable=1,width=630,height=460'
	}

	a_prop = a_prop + o_prop

	if (a_name = "") 
	{
		a_name = 'Obrazek'
	}

	if (a_obr != "") 
	{
		a_url = '/obrazek.asp?o=' + a_obr
		window.open (a_url, a_name, a_prop);
	}
}

function new_win (a_url, a_name, a_prop, a_sirka, a_vyska)
{
  if (a_url != "")
  {
    o_sirka = screen.width;
    o_vyska = screen.height;

    a_leva = (o_sirka - a_sirka) / 2
    a_horni = (o_vyska - a_vyska) / 2

    o_prop = ',width=' + a_sirka + ',height=' + a_vyska + ',left=' + a_leva + ',top=' + a_horni

    if (a_prop != "")
    {
      a_prop = a_prop + o_prop
    }
    else
    {
      a_prop = 'toolbar=0,scrollbars=1,status=0,menubar=0,resizable=1,width=630,height=460'
    }

    if (a_name = "")
    {
      a_name = 'Okno'
    }

    window.open (a_url, a_name, a_prop);
  }
}