function hideLayers()
{
	var delay = 2000; //2 secs
	setTimeout("document.getElementById('subnavigatie1').style.visibility='hidden'",delay*4);
	setTimeout("document.getElementById('subnavigatie1bg').style.visibility='hidden'",delay*4);
	setTimeout("document.getElementById('subnavigatie2').style.visibility='hidden'",delay);
	setTimeout("document.getElementById('subnavigatie2bg').style.visibility='hidden'",delay);
	setTimeout("document.getElementById('subnavigatie3').style.visibility='hidden'",delay);
	setTimeout("document.getElementById('subnavigatie3bg').style.visibility='hidden'",delay);
}

function showLayers()
{
	var delay = 1; //0 secs
	setTimeout("document.getElementById('subnavigatie1').style.visibility='visible'",delay);
	setTimeout("document.getElementById('subnavigatie1bg').style.visibility='visible'",delay);
	setTimeout("document.getElementById('subnavigatie2').style.visibility='visible'",delay);
	setTimeout("document.getElementById('subnavigatie2bg').style.visibility='visible'",delay);
	setTimeout("document.getElementById('subnavigatie3').style.visibility='visible'",delay);
	setTimeout("document.getElementById('subnavigatie3bg').style.visibility='visible'",delay);
}