// Determine browser.

var dom = (document.getElementById? 1:0);

var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&
                parseFloat(navigator.appVersion) >= 4)? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0) ? 1 : 0;



//-----------------------------------------------------------------------------
// Layer visibility.
//-----------------------------------------------------------------------------

function hideLayer(layer) {

  if(dom)
  {
    layer.style.visibility = "hidden";
  }
  if (isMinNS4)
    layer.visibility = "hide";
  if (isMinIE4)
    layer.style.visibility = "hidden";
}

function showLayer(layer) {

  if(dom)
  {
  	layer.style.visibility = "visible";
	return;
  }
  if (isMinNS4)
    layer.visibility = "show";
  if (isMinIE4)
    layer.style.visibility = "visible";
}

function getLayer(name) {

  if (dom)
  	return document.getElementById(name);
  if (isMinNS4)
    return findLayer(name, document);
  if (isMinIE4)
    return eval('document.all.' + name);
  return null;
}

function findLayer(name, doc) {

  var i, layer;

  for (i = 0; i < doc.layers.length; i++) {
    layer = doc.layers[i];
    if (layer.name == name)
      return layer;
    if (layer.document.layers.length > 0)
      if ((layer = findLayer(name, layer.document)) != null)
        return layer;
  }
  return null;
}

//-----------------------------------------------------------------------------
// Layer positioning.
//-----------------------------------------------------------------------------

function moveLayerBy(layer, dx, dy) {

  if (isMinNS4)
    layer.moveBy(dx, dy);
  if (isMinIE4) {
    layer.style.pixelLeft += dx;
    layer.style.pixelTop  += dy;
  }
}

function moveLayerTo(layer, x, y) {

  if (isMinNS4)
    layer.moveTo(x, y);
  if (isMinIE4) {
    layer.style.left = x;
    layer.style.top  = y;
  }
}

//-----------------------------------------------------------------------------
// Image utilities.
//-----------------------------------------------------------------------------

function getImage(name) {

  if (isMinNS4) {
    return findImage(name, document);
  }
  if (isMinIE4)
    return eval('document.all.' + name);
  return null;
}

function findImage(name, doc) {

  var i, img;

  for (i = 0; i < doc.images.length; i++)
    if (doc.images[i].name == name)
      return doc.images[i];
  for (i = 0; i < doc.layers.length; i++)
    if ((img = findImage(name, doc.layers[i].document)) != null) {
      img.container = doc.layers[i];
      return img;
    }
  return null;
}

function getImagePageLeft(img) {

  var x, obj;

  if (isMinNS4) {
    if (img.container != null)
      return img.container.pageX + img.x;
    else
      return img.x;
  }
  if (isMinIE4) {
    x = 0;
    obj = img;
    while (obj.offsetParent != null) {
      x += obj.offsetLeft;
      obj = obj.offsetParent;
    }
    x += obj.offsetLeft;
    return x;
  }
  return -1;
}

function getImagePageTop(img) {

  var y, obj;

  if (isMinNS4) {
    if (img.container != null)
      return img.container.pageY + img.y;
    else
      return img.y;
  }
  if (isMinIE4) {
    y = 0;
    obj = img;
    while (obj.offsetParent != null) {
      y += obj.offsetTop;
      obj = obj.offsetParent;
    }
    y += obj.offsetTop;
    return y;
  }
  return -1;
}


function getLeft(layer) {

  if (isMinNS4)
    return layer.left;
  if (isMinIE4)
    return layer.style.pixelLeft;
  return -1;
}

function getTop(layer) {

  if (isMinNS4)
    return layer.top;
  if (isMinIE4)
    return layer.style.pixelTop;
  return -1;
}

function getRight(layer) {

  if (isMinNS4)
    return layer.left + getWidth(layer);
  if (isMinIE4)
    return layer.style.pixelLeft + getWidth(layer);
  return -1;
}

function getBottom(layer) {

  if (isMinNS4)
    return layer.top + getHeight(layer);
  if (isMinIE4)
    return layer.style.pixelTop + getHeight(layer);
  return -1;
}

function getWidth(layer) {

  if (isMinNS4) {
    if (layer.document.width)
      return layer.document.width;
    else
      return layer.clip.right - layer.clip.left;
  }
  if (isMinIE4) {
    if (layer.style.pixelWidth)
      return layer.style.pixelWidth;
    else
      return layer.clientWidth;
  }
  return -1;
}

function getHeight(layer) {

  if (isMinNS4) {
    if (layer.document.height)
      return layer.document.height;
    else
      return layer.clip.bottom - layer.clip.top;
  }
  if (isMinIE4) {
    if (layer.style.pixelHeight)
      return layer.style.pixelHeight;
    else
      return layer.clientHeight;
  }
  return -1;
}