// 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);
}