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;



function hideLayer(layer) {

  if (isMinNS4)

    layer.visibility = "hide";

  if (isMinIE4)

    layer.style.visibility = "hidden";
}


function showLayer(layer) {

  if (isMinNS4)

    layer.visibility = "show";

  if (isMinIE4)

    layer.style.visibility = "visible";
}


function inheritLayer(layer) {

  if (isMinNS4)

    layer.visibility = "inherit";

  if (isMinIE4)

    layer.style.visibility = "inherit";
}


function getVisibility(layer) {

  if (isMinNS4) {

    if (layer.visibility == "show")

      return "visible";

    if (layer.visibility == "hide")

      return "hidden";

    return layer.visibility;

  }

  if (isMinIE4)

    return layer.style.visibility;

  return "";
}


function moveLayerTo(layer, x, y) {

  if (isMinNS4)

    layer.moveTo(x, y);

  if (isMinIE4) {

    layer.style.left = x;

    layer.style.top  = y;
  }
}


function moveLayerBy(layer, dx, dy) {

  if (isMinNS4)

    layer.moveBy(dx, dy);

  if (isMinIE4) {

    layer.style.pixelLeft += dx;

    layer.style.pixelTop  += dy;
  }
}


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 getPageLeft(layer) {

  var x;

  if (isMinNS4)

    return layer.pageX;

  if (isMinIE4) {

    x = 0;

    while (layer.offsetParent != null) {

      x += layer.offsetLeft;

      layer = layer.offsetParent;
    }

    x += layer.offsetLeft;

    return x;
  }

  return -1;
}


function getPageTop(layer) {

  var y;

  if (isMinNS4)

    return layer.pageY;

  if (isMinIE4) {

    y = 0;

    while (layer.offsetParent != null) {

      y += layer.offsetTop;

      layer = layer.offsetParent;
    }

    y += layer.offsetTop;

    return y;
  }

  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;
}


function getzIndex(layer) {

  if (isMinNS4)

    return layer.zIndex;

  if (isMinIE4)

    return layer.style.zIndex;

  return -1;
}


function setzIndex(layer, z) {

  if (isMinNS4)

    layer.zIndex = z;

  if (isMinIE4)

    layer.style.zIndex = z;
}


function clipLayer(layer, clipleft, cliptop, clipright, clipbottom) {

  if (isMinNS4) {

    layer.clip.left   = clipleft;

    layer.clip.top    = cliptop;

    layer.clip.right  = clipright;

    layer.clip.bottom = clipbottom;
  }

  if (isMinIE4)

    layer.style.clip = 'rect(' + cliptop + ' ' +  clipright + ' ' + clipbottom + ' ' + clipleft +')';
}


function getClipLeft(layer) {

  if (isMinNS4)

    return layer.clip.left;

  if (isMinIE4) {

    var str =  layer.style.clip;

    if (!str)

      return 0;

    var clip = getIEClipValues(layer.style.clip);

    return(clip[3]);
  }

  return -1;
}


function getClipTop(layer) {

  if (isMinNS4)

    return layer.clip.top;

  if (isMinIE4) {

    var str =  layer.style.clip;

    if (!str)

      return 0;

    var clip = getIEClipValues(layer.style.clip);

    return clip[0];
  }

  return -1;
}


function getClipRight(layer) {

  if (isMinNS4)

    return layer.clip.right;

  if (isMinIE4) {

    var str =  layer.style.clip;

    if (!str)

      return layer.style.pixelWidth;

    var clip = getIEClipValues(layer.style.clip);

    return clip[1];
  }

  return -1;
}


function getClipBottom(layer) {

  if (isMinNS4)

    return layer.clip.bottom;

  if (isMinIE4) {

    var str =  layer.style.clip;

    if (!str)

      return layer.style.pixelHeight;

    var clip = getIEClipValues(layer.style.clip);

    return clip[2];
  }

  return -1;
}


function getClipWidth(layer) {

  if (isMinNS4)

    return layer.clip.width;

  if (isMinIE4) {

    var str = layer.style.clip;

    if (!str)

      return layer.style.pixelWidth;

    var clip = getIEClipValues(layer.style.clip);

    return clip[1] - clip[3];
  }

  return -1;
}


function getClipHeight(layer) {

  if (isMinNS4)

    return layer.clip.height;

  if (isMinIE4) {

    var str =  layer.style.clip;

    if (!str)

      return layer.style.pixelHeight;

    var clip = getIEClipValues(layer.style.clip);

    return clip[2] - clip[0];
  }

  return -1;
}


function getIEClipValues(str) {

  var clip = new Array();

  var i;

  i = str.indexOf("(");

  clip[0] = parseInt(str.substring(i + 1, str.length), 10);

  i = str.indexOf(" ", i + 1);

  clip[1] = parseInt(str.substring(i + 1, str.length), 10);

  i = str.indexOf(" ", i + 1);

  clip[2] = parseInt(str.substring(i + 1, str.length), 10);

  i = str.indexOf(" ", i + 1);

  clip[3] = parseInt(str.substring(i + 1, str.length), 10);

  return clip;
}


function scrollLayerTo(layer, x, y, bound) {

  var dx = getClipLeft(layer) - x;

  var dy = getClipTop(layer) - y;

  scrollLayerBy(layer, -dx, -dy, bound);
}


function scrollLayerBy(layer, dx, dy, bound) {

  var cl = getClipLeft(layer);

  var ct = getClipTop(layer);

  var cr = getClipRight(layer);

  var cb = getClipBottom(layer);

  if (bound) {

    if (cl + dx < 0)

      dx = -cl;

    else if (cr + dx > getWidth(layer))

      dx = getWidth(layer) - cr;

    if (ct + dy < 0)

      dy = -ct;

    else if (cb + dy > getHeight(layer))

      dy = getHeight(layer) - cb;
  }

  clipLayer(layer, cl + dx, ct + dy, cr + dx, cb + dy);

  moveLayerBy(layer, -dx, -dy);
}


function setBgColor(layer, color) {

  if (isMinNS4)

    layer.bgColor = color;

  if (isMinIE4)

    layer.style.backgroundColor = color;
}


function setBgImage(layer, src) {

  if (isMinNS4)

    layer.background.src = src;

  if (isMinIE4)

    layer.style.backgroundImage = "url(" + src + ")";
}


function getLayer(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;
}


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 getWindowWidth() {

  if (isMinNS4)

    return window.innerWidth;

  if (isMinIE4)

    return document.body.clientWidth;

  return -1;
}


function getWindowHeight() {

  if (isMinNS4)

    return window.innerHeight;

  if (isMinIE4)

    return document.body.clientHeight;

  return -1;
}


function getPageWidth() {

  if (isMinNS4)

    return document.width;

  if (isMinIE4)

    return document.body.scrollWidth;

  return -1;
}


function getPageHeight() {

  if (isMinNS4)

    return document.height;

  if (isMinIE4)

    return document.body.scrollHeight;

  return -1;
}


function getPageScrollX() {

  if (isMinNS4)

    return window.pageXOffset;

  if (isMinIE4)

    return document.body.scrollLeft;

  return -1;
}


function getPageScrollY() {

  if (isMinNS4)

    return window.pageYOffset;

  if (isMinIE4)

    return document.body.scrollTop;

  return -1;
}