var nMaxItem     = 4;
var NameIndex    = 0;
var DefaultState = 1;

var MouseOverState = 2;
var MouseDownState = 3;
var imgCounter     = 0;

var ImageList = new Array();

var isRolloverOK = (
  ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) ||
  ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )) ||
  ((navigator.appName == "Opera") && (parseInt(navigator.appVersion) >= 4 ))
);

function AddImageToImageList(name, Default, MouseOver, MouseDown)
{
  ImageList[imgCounter] = new Array(nMaxItem);
  ImageList[imgCounter][NameIndex] = name;
  ImageList[imgCounter][DefaultState] = new Image();
  ImageList[imgCounter][DefaultState].src = Default;
  if (MouseOver != "") {
    ImageList[imgCounter][MouseOverState] = new Image();
    ImageList[imgCounter][MouseOverState].src = MouseOver;
  }
  if (MouseDown != "") {
    ImageList[imgCounter][MouseDownState] = new Image();
    ImageList[imgCounter][MouseDownState].src = MouseDown;
  }

  imgCounter++;
}

function ReplaceImage(name, state)
{
  if (isRolloverOK) {
    for (var i = 0; i < imgCounter; i++) {
      if (document.images[ImageList[i][NameIndex]] != null) {
        if ((name == ImageList[i][NameIndex]) && (ImageList[i][state] != null))
        document.images[name].src = ImageList[i][state].src;
      }
    }
  }
}