function switchMenu(obj) {
  var el = document.getElementById(obj);
  if ( el.style.display != 'none' ) {
  el.style.display = 'none';
  }
  else {
    el.style.display = '';
  }
}

function switchMenuForOS(obj) {
  if(isVista())
  {
    obj = obj +"Vista";
  }
  var el = document.getElementById(obj);
  if ( el.style.display != 'none' ) {
  el.style.display = 'none';
  }
  else {
    el.style.display = '';
  }
}

function isVista()
{
  var idxVersion = navigator.userAgent.indexOf("Windows NT");
  
  if(idxVersion!=-1)
  {
    var splitResult = navigator.userAgent.split("Windows NT");
    var osVersion = parseFloat(splitResult[1]);
    if(osVersion >= 6.0)
    {
        return true;
    }
  }
  return false;
}