function position() {
  var hoehe=0;
  if (navigator.userAgent.match(/7\.0/i)) {
    hoehe=(document.body.clientHeight-containerHeight+150)/2;
  }
  else if (navigator.userAgent.match(/msie 6\.0/i)) {
    hoehe=(document.body.clientHeight-containerHeight+20)/2;
  }
  else if (navigator.userAgent.match(/opera/i)) {
    hoehe=(document.body.clientHeight-containerHeight+300)/2;
  }
  else {
    hoehe=(document.body.clientHeight-containerHeight+200)/2;
  }
  if (hoehe>0) { document.getElementById('container').style.marginTop=hoehe+'px'; }
}

function position2() {
  var hoehe=0;
  if (navigator.userAgent.match(/7\.0/i)) {
    hoehe=(document.body.clientHeight-containerHeight+128)/2;
  }
  else if (navigator.userAgent.match(/msie 6\.0/i)) {
    hoehe=(document.body.clientHeight-containerHeight+4)/2;
  }
  else if (navigator.userAgent.match(/opera/i)) {
    hoehe=(document.body.clientHeight-containerHeight+266)/2;
  }
  else {
    hoehe=(document.body.clientHeight-containerHeight+166)/2;
  }
  if (hoehe>0) { document.getElementById('container').style.marginTop=hoehe+'px'; }
}