// ***** dhtml.js
// this is version 2 (20050212)
// this version is dom2 oriented, but does not manage totally non-dom browsers
// useful functions
//***** CheckBrowser
 var dom = (document.getElementById)? 1:0; // recent browsers using dom
 var nn = (document.layers&&!dom)? 1:0; // netscape 4+
 var ie = (document.all&&!dom)?    1:0; // old internet explorer
//***** Useful Tools
 function ShowLayer(lay)
 {
  if (nn) document.layers[lay].visibility = 'show';
  if (ie) document.all[lay].style.visibility = 'visible';
  if (dom) document.getElementById(lay).style.visibility = 'visible';
 }
 function HideLayer(lay)
 {
  if (nn) document.layers[lay].visibility = 'hide';
  if (ie) document.all[lay].style.visibility = 'hidden';
  if (dom) document.getElementById(lay).style.visibility = 'hidden';
 }
 function DispLayer(lay,d) // 1 or 0
 {
 // document.getElementById(lay).style.display = (d)?'block':'none';
  if (dom &d==0) document.getElementById(lay).style.display = "none";
  if (dom &d==1) document.getElementById(lay).style.display = "block";
  if (dom &d==2) document.getElementById(lay).style.display = "inline";
 }
 function PlaceLayer(lay,placeX,placeY)
 {
  if(ie) document.all[lay].style.left= placeX;
  if(ie) document.all[lay].style.top= placeY;
  if(nn) document.layers[lay].left= placeX;
  if(nn) document.layers[lay].top= placeY;
  if(dom) document.getElementById(lay).style.left= placeX;
  if(dom) document.getElementById(lay).style.top= placeY;
 }
// tools functions
function WriteMessage(lay,msg)
{
 if(dom) var layer = document.getElementById(lay);
 if(nn)  var layer = document.layes(lay);
 if(ie)  var layer = document.all[lay]; // pretty sure that this does not work
 layer.innerHTML = msg;
}
function SwapImage(img,source,lay)
{
 if (nn && lay) document.layers[lay].document.images[img].src = source;
 else document.images[img].src = source;
}
function addChildLayer(text, parent, lid)
{
 var parentLayer = document.getElementById(parent);
 var childLayer = document.createElement("div");
 childLayer.setAttribute("id",lid);
 
 // add some text to the layer
 childLayer.innerHTML = text
 // finally, add the new layer to the parent layer
 parentLayer.appendChild(childLayer);
}
// specific functi