if (document.images)
   {
     pic1on= new Image(100,25);
     pic1on.src="./images/btn_home_over.png";  
     pic1off= new Image(100,25);
     pic1off.src="./images/btn_home.png";
	 
	 pic2on= new Image(100,25);
     pic2on.src="./images/btn_dezaak_over.png";  
     pic2off= new Image(100,25);
     pic2off.src="./images/btn_dezaak.png";
	 
	 pic3on= new Image(100,25);
     pic3on.src="./images/btn_menu_over.png";  
     pic3off= new Image(100,25);
     pic3off.src="./images/btn_menu.png";
	 
	 pic4on= new Image(100,25);
     pic4on.src="./images/btn_nieuws_over.png";  
     pic4off= new Image(100,25);
     pic4off.src="./images/btn_nieuws.png";
	 
	 pic5on= new Image(100,25);
     pic5on.src="./images/btn_contact_over.png";  
     pic5off= new Image(100,25);
     pic5off.src="./images/btn_contact.png";
   }

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }