function getPosition(element)
{
  var elem=element,tagname="",x=0,y=0;

  while ((typeof(elem)=="object")&&(typeof(elem.tagName)!="undefined"))
  {
    y+=elem.offsetTop;     /* Offset des jeweiligen Elements addieren */
    x+=elem.offsetLeft;    /* Offset des jeweiligen Elements addieren */
    tagname=elem.tagName.toUpperCase(); /* tag-Name ermitteln, Grossbuchstaben */

    if (tagname=="BODY")
      elem=0;

    if (typeof(elem)=="object")
      if (typeof(elem.offsetParent)=="object")
        elem=elem.offsetParent;
  }

  position=new Object();
  position.y=y;
  return position;
}

function alertPosition(elementId)
{
  var a,element;
  element=document.getElementById(elementId);
  a=getPosition(element);
  return a.y;
}

function divresize(){
var simg1 = alertPosition("div_fill1");
var simg2 = alertPosition("div_fill2");
var simg3 = alertPosition("div_fill3");
var fimg = alertPosition("footer");
//window.alert("Test -"+simg1);
// Blendet die div_fills der kürzenren Seiten ein
if(simg3 < simg2 || simg3 < simg1){document.getElementById("div_fill3").style.visibility = "visible"; var open_div3 = 1;}
if(simg2 < simg3 || simg2 < simg1){document.getElementById("div_fill2").style.visibility = "visible"; var open_div2 = 1;}
if(simg1 < simg3 || simg1 < simg2){document.getElementById("div_fill1").style.visibility = "visible"; var open_div1 = 1;}
// Berechnet die benötigte Höhe der div_fills
var divhight1 = fimg - simg1 - 34;
var divhight2 = fimg - simg2 - 34;
var divhight3 = fimg - simg3 - 34;
// Bringt die benötigten div_fills auf die richtige Länge
if(open_div1){document.getElementById("div_fill1").style.height="" + divhight1 + "px";}
if(open_div2){document.getElementById("div_fill2").style.height="" + divhight2 + "px";}
if(open_div3){document.getElementById("div_fill3").style.height="" + divhight3 + "px";}
// Wenn zu klein div_fill ausblenden
if(divhight1 < 0){document.getElementById("div_fill1").style.visibility = "collapse";}
if(divhight2 < 0){document.getElementById("div_fill2").style.visibility = "collapse";}
if(divhight3 < 0){document.getElementById("div_fill3").style.visibility = "collapse";}
}