if (document.images) {
  image1on = new Image();
  image1on.src="images/nav_home_on.gif";

  image2on = new Image();
  image2on.src="images/nav_about_on.gif";

  image3on = new Image();
  image3on.src="images/nav_weddings_on.gif";
  
  image4on = new Image();
  image4on.src="images/nav_mitzvahs_on.gif";
    
  image5on = new Image();
  image5on.src="images/nav_events_on.gif";

  image6on = new Image();
  image6on.src="images/nav_schools_on.gif";

  image7on = new Image();
  image7on.src="images/nav_links_on.gif";

  image8on = new Image();
  image8on.src="images/nav_contact_on.gif";
  
  image1off = new Image();
  image1off.src="images/nav_home.gif";

  image2off = new Image();
  image2off.src="images/nav_about.gif";

  image3off = new Image();
  image3off.src="images/nav_weddings.gif";
  
  image4off = new Image();
  image4off.src="images/nav_mitzvahs.gif";
    
  image5off = new Image();
  image5off.src="images/nav_events.gif";

  image6off = new Image();
  image6off.src="images/nav_schools.gif";

  image7off = new Image();
  image7off.src="images/nav_links.gif";

  image8off = new Image();
  image8off.src="images/nav_contact.gif";
}

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");
    }
  }
}