function ShowLayerById(id)
{   
	document.getElementById(id).style.visibility = "visible";
	if ( (document.getElementById(id).tagName=="TR") && (navigator.userAgent.toLowerCase().indexOf("msie")<0) )
	{
	   document.getElementById(id).style.display = "table-row";
	}
	else
	{
	   document.getElementById(id).style.display = "block";
	}	
}
function HideLayerById(id)
{
	document.getElementById(id).style.visibility = "hidden";
	document.getElementById(id).style.display = "none";
}


function ToggleVraagAntwoord(nummer)
{
   if (document.getElementById('antwoord'+nummer).style.display == 'none')
   {
      ShowLayerById('antwoord'+nummer);
      document.getElementById('VraagPijl'+nummer).src = 'images/faq-pointer-down.gif';
   }
else
   {
      HideLayerById('antwoord'+nummer);
      document.getElementById('VraagPijl'+nummer).src = 'images/faq-pointer.gif';
   }
}