var Pfeil_zu    = new Image(); Pfeil_zu.src='Bilder/Pfeil_zu.gif';
var Pfeil_offen = new Image(); Pfeil_offen.src='Bilder/Pfeil_offen.gif';

function ein_ausblenden(Element)
{
  if (document.getElementById(Element).style.display=='none') 
  {
    document.getElementById(Element).style.display='block';
    if(document.getElementById('pfeil_'+Element)) document.getElementById('pfeil_'+Element).src=Pfeil_offen.src;
  }
  else 
  {
    document.getElementById(Element).style.display='none';
    if(document.getElementById('pfeil_'+Element)) document.getElementById('pfeil_'+Element).src=Pfeil_zu.src;    
  }
  
}