function zeigen(name) {
  // document.getElementById("OES").style.left = "" + (screen.width/2 - 250) + "px";
  // document.getElementById("OES").style.top = "" + (screen.height/2 - 150) + "px";

  if (document.layers) { document.layers[''+name].visibility = "show"; }                                // NN 4.x
  if (document.getElementById) { document.getElementById(name).style.visibility="visible"; }            // IE 5.x und NN 6, 7
  if (document.all && !document.getElementById) { document.all[''+name].style.visibility = "visible"; } // IE 4
}

function verbergen(name) {
  if (document.layers) { document.layers[''+name].visibility = "hide"; }
  if (document.getElementById) { document.getElementById(name).style.visibility="hidden"; }
  if (document.all && !document.getElementById) { document.all[''+name].style.visibility = "hidden"; }
}

function setOpac(n,name) {
  if(n==1) { 
    if(navigator.userAgent == "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)") {
      document.getElementById(name).style.filter = "Alpha(opacity=50)";
    } else { 
      document.getElementById(name).style.opacity = "0.5"; 
    }
  } else if(n==2) {
    if(navigator.userAgent == "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)") {
      document.getElementById(name).style.filter = "Alpha(opacity=100)";
    } else { 
      document.getElementById(name).style.opacity = "1.0"; 
    }
  }
  else return;
}