bionorm = new Image(200,20);              
    bionorm.src = "../../images/button/bio1.gif";   
    biohigh = new Image(200,20);              
    biohigh.src = "../../images/button/bio2.gif"; 
    chrononorm = new Image(200,20);              
    chrononorm.src = "../../images/button/chrono1.gif";   
    chronohigh = new Image(200,20);              
    chronohigh.src = "../../images/button/chrono2.gif"; 
    begrnorm = new Image(200,20);              
    begrnorm.src = "../../images/button/begriff1.gif";   
    begrhigh = new Image(200,20);              
    begrhigh.src = "../../images/button/begriff2.gif";     
    archivnorm = new Image(200,20);              
    archivnorm.src = "../../images/button/archiv1.gif";   
    archivhigh = new Image(200,20);              
    archivhigh.src = "../../images/button/archiv2.gif";     
    litnorm = new Image(200,20);              
    litnorm.src = "../../images/button/lit1.gif";   
    lithigh = new Image(200,20);              
    lithigh.src = "../../images/button/lit2.gif";     
    impressnorm = new Image(200,20);              
    impressnorm.src = "../../images/button/impress1.gif";   
    impresshigh = new Image(200,20);              
    impresshigh.src = "../../images/button/impress2.gif";     
    suchenorm = new Image(200,20);              
    suchenorm.src = "../../images/button/suche1.gif";   
    suchehigh = new Image(200,20);              
    suchehigh.src = "../../images/button/suche2.gif";     
    hilfenorm = new Image(200,20);              
    hilfenorm.src = "../../images/button/hilfe1.gif";   
    hilfehigh = new Image(200,20);              
    hilfehigh.src = "../../images/button/hilfe2.gif";   
              
function Bildwechsel(nr,Bild) 
{
  window.document.images[nr].src = Bild.src;
}