if(document.getElementById&&!document.all)
  {
    ns6=1;
  }
  else
  {
    ns6=0;
  }

var valami=navigator.userAgent.toLowerCase();
var operabong=(valami.indexOf('opera')!=-1);
var folder='';


function mutat(letolt)
  {
    if(document.getElementById(letolt))
    {
      folder=document.getElementById(letolt).style;
    }
    else
    {
      if(ns6==1 || operabong==true)
      {
        folder=letolt.nextSibling.style;
      }
      else
      {
        folder=document.all[letolt.sourceIndex+1].style;
      }
    }
    if (folder.display=="none")
    {
      folder.display="";
    }
    else
    {
      folder.display="none";
    }
  }