var NN3=false;

img1=new Image();
img1.src="images/nav_start.gif";
img1over=new Image();
img1over.src="images/nav_startsw.gif";

img2=new Image();
img2.src="images/nav_wir.gif";
img2over=new Image();
img2over.src="images/nav_wirsw.gif";

img3=new Image();
img3.src="images/nav_philo.gif";
img3over=new Image();
img3over.src="images/nav_philosw.gif";

img4=new Image();
img4.src="images/nav_prod.gif";
img4over=new Image();
img4over.src="images/nav_prodsw.gif";

img5=new Image();
img5.src="images/nav_kun.gif";
img5over=new Image();
img5over.src="images/nav_kunsw.gif";

img6=new Image();
img6.src="images/nav_vit.gif";
img6over=new Image();
img6over.src="images/nav_vitsw.gif";

img7=new Image();
img7.src="images/nav_stell.gif";
img7over=new Image();
img7over.src="images/nav_stellsw.gif";

img8=new Image();
img8.src="images/nav_links.gif";
img8over=new Image();
img8over.src="images/nav_linkssw.gif";

img9=new Image();
img9.src="images/nav_kon.gif";
img9over=new Image();
img9over.src="images/nav_konsw.gif";

function on3(name)
  {
   document[name].src=eval(name+"over.src");
  }

function off3(name)
        {
        document[name].src=eval(name+".src");
        }

NN3=true;

function on(name)
        {
        if (NN3) on3(name);
        }

function off(name)
        {
        if (NN3) off3(name);
        }