function fenster_impressum()
{
  fenster=open('impressum.htm','fenster_impressum','height=610, width=370,resizable=no,top=40, left=5');
  fenster.focus();
}

function fenster_kontakt()
{
  fenster=open('kontakt.htm','fenster_kontakt','height=580, width=580, resizable=no, top=90, left=260');
  fenster.focus();
}

function fenster_stand()
{
  fenster=open('stand.htm','fenster_stand','height=470, width=600, resizable=no, top=70, left=260, scrollbars=yes');
  fenster.focus();
}

function fenster_mitflugtag()
{
  fenster=open('mitflugtag.htm','fenster_mitflugtag','height=675, width=450,resizable=no,top=40, left=260, scrollbars=no');
  fenster.focus();
}

// --------------------------------------------------------
function check_darstellung()
{
  if (screen.height < 768) // falls Auflösung kleiner 1024x768
  {
    fenster=open('darstellung.htm','darstellung','height=300, width=500, resizable=no');
    fenster.focus();
  }
}