isDOM=document.getElementById //DOM1 browser (MSIE 5+, Netscape 6, Opera 5+)
isMSIE=document.all && document.all.item //MSIE 4+
isNetscape4=document.layers //Netscape 4.*
isOpera=window.opera //Opera
isOpera5=isOpera && isDOM //Opera 5+
isMSIE5=isDOM && isMSIE && !isOpera //MSIE 5+
isMozilla=isNetscape6=isDOM && !isMSIE && !isOpera


function change_skin(skin)
{
	location.href = "index.php?skin=" + skin;
}

var idGlb;
var idSub;
var flagSub;


function getLayer(layerName)
{
  if (!layerName)
  {
    return false;
  }
  
  if (isDOM)
  {
    return document.getElementById(layerName);
  }
  if (isMSIE)
  {
    return document.all[layerName];
  }
  if (isNetscape4)
  {
    return eval('document.layers[layerName]');
  }
  
  return false;
}


function setStyle(idSct)
{
  var sLayer;
  var tLayer;
  var subLayer;
  
  tLayer = getLayer(idGlb);
  subLayer = getLayer(idSub);
  sLayer = getLayer(idSct);

  if (subLayer)
  {
    if (sLayer == subLayer)
    {
      flagSub = !flagSub ? 1 : 0;
      sLayer.style.display = flagSub ? 'none' : isMSIE5 ? 'block' : 'table-row';
    }
  }

  if (sLayer)
  {
    if (tLayer)
    {
      idGlb = '';
      tLayer.style.display = 'none';
    }
    
    if (sLayer != subLayer && sLayer != tLayer)
    {
      idGlb = idSct;
      sLayer.style.display = isMSIE5 ? 'block' : 'table-row';
    }
  }

  return false;
}