/******************************************************************************
* dhtmllib.js                                                                 *
*                                                                             *
* Copyright 1999 by Mike Hall.                                                *
* Web address: http://www.brainjar.com                                        *
* Last update: November 30, 1999.                                             *
*                                                                             *
* Provides basic functions for DHTML positioned elements which will work on   *
* both Netscape Communicator and Internet Explorer browsers (version 4.0 and  *
* up).                                                                        *
******************************************************************************/

// Determine browser.

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 (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 isVisible(layer) {

 if (isMinNS4 && layer.visibility == "show")
  return(true);
 if (isMinIE4 && layer.style.visibility == "visible")
  return(true);

 return(false);
}

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

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

function getPageLeft(layer) {

 if (isMinNS4)
  return(layer.pageX);
 if (isMinIE4)
  return(layer.offsetLeft);
 return(-1);
}

function getPageTop(layer) {

 if (isMinNS4)
  return(layer.pageY);
 if (isMinIE4)
  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 (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 (false && 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;
}

//-----------------------------------------------------------------------------
// Layer clipping.
//-----------------------------------------------------------------------------

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;

 // Parse out the clipping values for IE layers.

 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);
}

//-----------------------------------------------------------------------------
// 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);
}

//-----------------------------------------------------------------------------
// Layer background.
//-----------------------------------------------------------------------------

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 + ")";
}

//-----------------------------------------------------------------------------
// Layer utilities.
//-----------------------------------------------------------------------------

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) {
   layer = findLayer(name, layer.document);
   if (layer != null)
    return layer;
  }
 }

 return null;
}

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

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);
}