// Popup fuer Kontaktfomular
function kontakt ()
{
  window.open('/mailform.php',"Kontaktformular","width=586,height=418,scrollbars=0,toolbar=0,location=0,directories=0,status=0,menubar=0,resizable=0")
}

// Popup fuer Sitemap width = 274 + scrollbar (16) = 290
function sitemap ()
{
  window.open('/sitemap.html',"Sitemap","width=290,height=418,scrollbars=1,toolbar=0,location=0,directories=0,status=0,menubar=0,resizable=0")
}

// Popup fuer GIS
function gis ()
{
  window.open('http://www.duisburg.de/gis/stadtplan/hrclient/stadtplan.php',"Stadtplan","width=980,height=725,scrollbars=1,toolbar=0,location=0,directories=0,status=0,menubar=0,resizable=1")
}

// Popup fuer Internet Policy und Impressum
function policyimpressum (anchor)
{
  var jump;
  jump = '';
  if (anchor == 'impressum') { jump = '#' + anchor; }
  window.open('policy.html' + jump,"Impressum","scrollbars=1,toolbar=0,menubar=0,status=0,location=0,directories=0,resizable=0,width=568,height=418")
}

zeigen     = "block";
verstecken = "none";

function machauf(id1,id2)
{
  if (document.getElementById)
  {
    document.getElementById(id1).style.display=zeigen;
    document.getElementById(id2).style.display=verstecken;
  }
  else
  {
    eval(id1+".style.display=zeigen");
    eval(id2+".style.display=verstecken");
  }
}