var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&
                parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
var isNS6	 = (document.getElementById)? true:false;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0) ? 1 : 0;

if (isNS6)
{
	isMinNS4 = 0;
}

// Microsoft Stupidity Check(tm).
if (isMinIE4) {
	if (isNS6) {
		isNS6 = false;
	}
}


// ---------------------------------------------------------------------
// Standard DHTML functions here...
//
// (Hunt the Pants code at the bottom)
// ---------------------------------------------------------------------

/******************************************************************************
* Copyright 1999 by Mike Hall.                                                *
* Web address: http://www.brainjar.com                                        *
* Last update: February 26, 2000.                                             *
*                                                                             *
* Provides basic functions for DHTML positioned elements which will work on   *
* both Netscape Communicator and Internet Explorer browsers (version 4.0 and  *
* up).                                                                        *
******************************************************************************/

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

function hideLayer(layer) {

  if (isNS6)
  {
	layer.style.visibility = "hidden";
  } else {
	  if (isMinNS4)
		layer.visibility = "hide";
	  if (isMinIE4)
		layer.style.visibility = "hidden";
  }
}

function showLayer(layer) {

  if (isNS6)
  {
//	layer.style.display = "block";
	layer.style.visibility = "visible";
  } else {
	  if (isMinNS4)
		layer.visibility = "show";
	  if (isMinIE4)
		layer.style.visibility = "visible";
  }
}


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

function moveLayerTo(layer, x, y) {

  if (isNS6) {
		layer.style.left = parseInt(x);
		layer.style.top = parseInt(y);
  }	else {
	  if (isMinNS4)
		layer.moveTo(x, y);
	  if (isMinIE4) {
		layer.style.left = x;
		layer.style.top  = y;
	  }
  }
}

function moveLayerBy(layer, dx, dy) {

  if (isNS6) {
		layer.style.left = parseInt(parseInt(layer.style.left) + parseInt(dx));
		layer.style.top  = parseInt(parseInt(layer.style.top) + parseInt(dy));
  }	else {
	  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;
  if (isNS6)
    return layer.style.left;
  return -1;
}

function getTop(layer) {

  if (isMinNS4)
    return layer.top;
  if (isMinIE4)
    return layer.style.pixelTop;
  if (isNS6)
    return layer.style.top;
  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;
}


//-----------------------------------------------------------------------------
// Layer scrolling.
//-----------------------------------------------------------------------------

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);
}

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

function getImage(name) {

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

  if (isNS6)
	{
    return document.getElementById(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) || (isNS6)) {
    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) || (isNS6)) {
    y = 0;
    obj = img;
    while (obj.offsetParent != null) {
      y += obj.offsetTop;
      obj = obj.offsetParent;
    }
    y += obj.offsetTop;
    return y;
  }
  return -1;
}


//-----------------------------------------------------------------------------
// Window and page properties.
//-----------------------------------------------------------------------------

function getWindowWidth() {

  if (isMinNS4 || isNS6)
    return window.innerWidth;
  if (isMinIE4)
    return document.body.clientWidth;
  return -1;
}

function getWindowHeight() {

  if (isMinNS4 || isNS6)
    return window.innerHeight;
  if (isMinIE4)
    return document.body.clientHeight;
  return -1;
}

function getPageScrollX() {

  if (isMinNS4 || isNS6)
    return window.pageXOffset;
  if (isMinIE4)
    return document.body.scrollLeft;
  return -1;
}

function getPageScrollY() {

  if (isMinNS4 || isNS6)
    return window.pageYOffset;
  if (isMinIE4)
    return document.body.scrollTop;
  return -1;
}

function getFramePageScrollY(frame) {

  if (isMinNS4 || isNS6)
    return eval(frame + '.window.pageYOffset;');
  if (isMinIE4)
    return eval(frame + '.document.body.scrollTop;');
  return -1;
}

function getFramePageScrollX(frame) {

  if (isMinNS4 || isNS6)
    return eval(frame + '.window.pageXOffset;');
  if (isMinIE4)
    return eval(frame + '.document.body.scrollLeft;');
  return -1;
}