function new_window(url, name, nwidth, nheight){
   if(!nwidth) nwidth=800;
   if(!nheight) nheight=600;
   window.open(url, name, "status=yes,toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,width="+nwidth+",height="+nheight);
 }
 function layer(layerName){
   //DOM1
   if(document.getElementById) return document.getElementById(layerName)
   //MSIE4
   if(document.all) return document.all[layerName]
   //Netscape 4
   if(document.layers) return document.layers[layerName]
   //?
   return null
 }

 function layerShowHide(sname, show){
  theLayer=layer(sname);
  if (theLayer!=null)
  {
     if (!show) 
     {
        if(theLayer.style.display=='')
          theLayer.style.display='none';
        else 
          theLayer.style.display='';
     }
     else
     {
        if(show==true)
          theLayer.style.display='';
        else
          theLayer.style.display='none';
     }
  }
 }

 function show_hide_description(name){
  theLayer=layer(name);
  if (theLayer!=null)
  {
     if(theLayer.style.display=='')
     {
       theLayer.style.display='none';
       document['image'+name].src='pics/redo.gif';
       document['image'+name].alt='далі';
     }
     else
     {
       theLayer.style.display='';
       document['image'+name].src='pics/undo.gif';
       document['image'+name].alt='сгорнути';
     }
  }
}