function setToTopLink() {
  if(document.all) {
    bh = document.body.offsetHeight;
    dd = document.getElementById('seitenende').offsetTop;
    if (document.body.offsetHeight>(document.getElementById('seitenende').offsetTop + document.getElementById('seitenende').offsetHeight)) {
       writeHTMLinElement('toTop', '');
    }
  } else {
    bh = window.innerHeight;
    dd = document.body.offsetHeight;
    if (document.body.offsetHeight<window.innerHeight) { 
      writeHTMLinElement('toTop', '');
    }
  }
}

function writeHTMLinElement(id, html) {
  // writes an HTML-String in an HTML-Element (fetched by ID)...
  var e = document.getElementById(id);
  e.innerHTML = html;
}

function resizeWindow(w, h) {
  // resize current window...
  window.resizeTo(w,h);
  //window.innerHeight = h;
  //window.innerWidth = w;
}

function swapImage(imgName, imgSrc) {
  if (document.images) {
    document.images[imgName].src = imgSrc;
  }
}

function imgOn(imgName) {
  if (document.images && activeImg != imgName) {
    document.images[imgName].src = bild_mo_arr[imgName];
  }
}

function imgOff(imgName) {
  if (document.images && activeImg != imgName) {
    document.images[imgName].src = bild_arr[imgName];;
  }
}

function imgClick(imgBild) {
  if(activeImg != "") {
    temp = activeImg;
    activeImg = imgBild;
    imgOff(temp);
  } else { 
    activeImg = imgBild; 
  }
}

function showHide(name) {
		var e = document.getElementById(name);
		e.style.left = (e.style.left == '3em') ? '-3em' : '3em';
}