var isMinNS4 = document.layers
var ie=document.all&&navigator.userAgent.indexOf("Opera")==-1
var dom=document.getElementById&&!ie&&navigator.userAgent.indexOf("Opera")==-1


function getLayer(name) {
  if (isMinNS4)
    return findLayer(name, document);
  if (ie)
    return eval('document.all.' + name);
  if (dom)
    return document.getElementById(name);
  return null;
}


function getLeft(layer) {

  if (isMinNS4)
    return(layer.left);
  if (ie||dom)
    return(parseInt(layer.style.left));
  return(-1);
}

function getTop(layer) {

  if (isMinNS4)
    return(layer.top);
  if (ie||dom)
    return(parseInt(layer.style.top));
  return(-1);
}

function getRight(layer) {

  if (isMinNS4)
    return(layer.left + getWidth(layer));
  if (ie||dom)
    return(parseInt(layer.style.left) + getWidth(layer));
  return(-1);
}

function getBottom(layer) {

  if (isMinNS4)
    return(layer.top + getHeight(layer));
  else if (ie||dom)
    return(parseInt(layer.style.top) + getHeight(layer));
  return(-1);
}

function getPageLeft(layer) {

  if (isMinNS4)
    return(layer.pageX);
  if (ie||dom)
    return(layer.offsetLeft);
  return(-1);
}

function getPageTop(layer) {

  if (isMinNS4)
    return(layer.pageY);
  if (ie||dom)
    return(layer.offsetTop);
  return(-1);
}

function getWidth(layer) {

  if (isMinNS4) {
    if (layer.document.width)
      return(layer.document.width);
    else
      return(layer.clip.right - layer.clip.left);
  }
  if (ie||dom) {
    if (layer.style.width)
      return(layer.style.width);
    else
      return(layer.offsetWidth);
  }
  return(-1);
}

function getHeight(layer) {

  if (isMinNS4) {
    if (layer.document.height)
      return(layer.document.height);
    else
      return(layer.clip.bottom - layer.clip.top);
  }
  if (ie||dom) {
    if (false && layer.style.height)
      return(layer.style.height);
    else
      return(layer.offsetHeight);
  }
  return(-1);
}

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


function moveLayerTo(layer, x, y) {

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

function hideLayer(layer) {

  if (isMinNS4)
    layer.visibility = "hide";
  if (ie||dom)
    layer.style.visibility = "hidden";
}

function showLayer(layer) {

  if (isMinNS4)
    layer.visibility = "show";
  if (ie||dom)
    layer.style.visibility = "visible";
}