if (document.images) {
  image1on = new Image();
  image1on.src = "images/sw_01_on.jpg";

  image2on = new Image();
  image2on.src = "images/sw_02_on.jpg";

  image3on = new Image();
  image3on.src = "images/sw_03_on.jpg";
  
  image4on = new Image();
  image4on.src = "images/sw_04_on.jpg";
  
  image5on = new Image();
  image5on.src = "images/sw_05_on.jpg";
      
  image1off = new Image();
  image1off.src = "images/sw_01_off.jpg";

  image2off = new Image();
  image2off.src = "images/sw_02_off.jpg";

  image3off = new Image();
  image3off.src = "images/sw_03_off.jpg";

  image4off = new Image();
  image4off.src = "images/sw_04_off.jpg";
  
  image5off = new Image();
  image5off.src = "images/sw_05_off.jpg";
   
  image6off = new Image();
  image6off.src = "images/website_sw_off.jpg"; 
  
  image7off = new Image();
  image7off.src = "images/publns_sw_off.jpg";
  }

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}