//dynamic foto
var maxdf = 0
var activedf = 0;
var arrdf;
var df;

function loopdf()
{
	if (maxdf == 0)
	{
		arrdf = $('dynamic').select('.dynamic');
		maxdf = arrdf.length;
		if (maxdf > 0)
			showdf();
	}
}

function showdf()
{
	if (activedf < maxdf)
	{
		df = arrdf[activedf];
		var effect = new Effect.Opacity(df, {
			duration: 2.0,
			transition: Effect.Transitions.linear,
			from: 0,
			to: 1,
			beforeStart: function()
			{
				df.setOpacity(0);
				df.style.zIndex = 2;
			},
			afterFinish: function()
			{
				if (maxdf > 1)
					hidedf();
			}
		});
	}
}

function hidedf()
{
	var effect = new Effect.Opacity(df, {
		delay: df.select('.interval')[0].innerHTML,
		duration: 1.0,
		transition: Effect.Transitions.linear,
		from: 1,
		to: 0,
		afterFinish: function ()
		{	
			df.style.zIndex = -1;
			activedf += 1;
			if (activedf >= maxdf)
				activedf = 0;
			showdf();
		}
	});
}

Event.observe(window, 'load', function() {
	loopdf();
});

function checkValue()
{
	var trefwoord = document.getElementById("trefwoord").value;
	if (trefwoord.length < 3)
		alert("De zoekopdracht moet uit minstens drie tekens bestaan");
	else
		if (trefwoord == "trefwoord |")
			alert("U heeft nog geen trefwoord ingevuld");
		else
			document.getElementById("frmZoeken").submit();
}

function disableEnterKey(e)
{
	 var key;

	 if(window.event)
		  key = window.event.keyCode;     //IE
	 else
		  key = e.which;     //firefox

	 if(key == 13)
		  return false;
	 else
		  return true;
}