function wechsel(wert) 
{ 
  
  obj = document.getElementsByTagName("div");
		    if (obj[wert].style.display == 'block'){
		        obj[wert].style.display = 'none';
		    } else {
		        obj[wert].style.display = 'block';
		    }
}
function SwapImage(img)
{
   if(typeof(img.swap) == "undefined")
   {
      img.swap= true;
      img.origSrc = "http://www.linguatools.de/images/plus.gif";
   }
   if(img.swap)
   {
      img.src = "http://www.linguatools.de/images/minus.gif";
   }
   else
   {
      img.src = img.origSrc;
   }
   img.swap= !img.swap;
}