var null_func = function()
{
  // do nothing
}

function addLoadListener(fn)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent('onload', fn);
  }
  else
  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = fn;
    }
    else
    {
      window.onload = function()
      {
        oldfn();
        fn();
      };
    }
  }
}
addLoadListener(init);
function init()
{
  document.onmousedown = toggle.mouseDownHandler;
}

var toggle = new function(e)
{
  this.getSrcElem = function(e)
  {
    var ret = null;
    if(e.srcElement)
    {
      ret = e.srcElement;
    }
    else if(e.target)
    {
      ret  = e.target;
    }

    if(!(ret.parentNode.parentNode.id == 'faq' && ret))
    {
      ret = null;
    }
    return ret;
  };

  this.mouseDownHandler = function(e)
  {
    var self = toggle;
    var id = '';
    if(!e)
    {
      e = window.event;
    }

    var target = self.getSrcElem(e);
    if(target)
    {
      var content = target.parentNode.getElementsByTagName('ul');
      for(var i = 0; i < content.length; i++)
      {      
        if(content[i].style.display != 'block')
        {
          content[i].style.display = 'block';
        }
        else
        {
          content[i].style.display = 'none';
        }
      } 

    }
  };  
}