Normal1 = new Image();
Normal1.src = "./img/news.gif";     
Highlight1 = new Image();
Highlight1.src = "./img/news-b.gif"; 

Normal2 = new Image();
Normal2.src = "./img/leistungen.gif";     
Highlight2 = new Image();
Highlight2.src = "./img/leistungen-b.gif"; 

Normal3 = new Image();
Normal3.src = "./img/portfolio.gif";     
Highlight3 = new Image();
Highlight3.src = "./img/portfolio-b.gif"; 

Normal4 = new Image();
Normal4.src = "./img/about.gif";     
Highlight4 = new Image();
Highlight4.src = "./img/about-b.gif"; 

Normal5 = new Image();
Normal5.src = "./img/kontakt.gif";     
Highlight5 = new Image();
Highlight5.src = "./img/kontakt-b.gif"; 



function Bildwechsel (Bildnr, Bildobjekt) {
  window.document.images[Bildnr].src = Bildobjekt.src;
}