//=============================
// Controls the rollovers 
// for the NGBTM navigation
// PMW/NGS updated 12/12/01
//=============================


if (document.images) {

  image1on = new Image();
  image1on.src = "/media/ngbeyond/rings/images/nav_author_on.gif";

  image2on = new Image();
  image2on.src = "/media/ngbeyond/rings/images/nav_language_on.gif";
  
  image3on = new Image();
  image3on.src = "/media/ngbeyond/rings/images/nav_myth_on.gif";
  
  image4on = new Image();
  image4on.src = "/media/ngbeyond/rings/images/nav_gallery_on.gif";
  
  image1off = new Image();
  image1off.src = "/media/ngbeyond/rings/images/nav_author_off.gif";

  image2off = new Image();
  image2off.src = "/media/ngbeyond/rings/images/nav_language_off.gif";
  
  image3off = new Image();
  image3off.src = "/media/ngbeyond/rings/images/nav_myth_off.gif";
  
  image4off = new Image();
  image4off.src = "/media/ngbeyond/rings/images/nav_gallery_off.gif";
  
 }

function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "on.src");
  }
} 

function turnOff(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "off.src");
  }
}