function enableFields()
{
	if (document.addevent.dag.checked)
	{
		document.addevent.tijd1a.disabled=true;
		document.addevent.tijd1b.disabled=true;
		document.addevent.datum2.disabled=true;
		document.addevent.tijd2a.disabled=true;
		document.addevent.tijd2b.disabled=true;
		document.addevent.dag.value="yes";
	}
	else
	{
		document.addevent.tijd1a.disabled=false;
		document.addevent.tijd1b.disabled=false;
		document.addevent.datum2.disabled=false;
		document.addevent.tijd2a.disabled=false;
		document.addevent.tijd2b.disabled=false;
		document.addevent.dag.value="";
	}
}
function enablePrice()
{
	if (document.addevent.gratis.checked)
	{
		document.addevent.kosten.disabled=true;
		document.addevent.gratis.value="yes";
	}
	else
	{
		document.addevent.kosten.disabled=false;
		document.addevent.gratis.value="";
	}
}

function enableOnbekend()
{
	if (document.addevent.onbekend.checked)
	{
		document.addevent.kosten.disabled=true;
		document.addevent.onbekend.value="yes";
	}
	else
	{
		document.addevent.kosten.disabled=false;
		document.addevent.onbekend.value="";
	}
}

function enableIframe()
{
	var me = document.getElementById('foto_toevoegen');
	
	if (me.style.visibility=="hidden"){
		me.style.visibility="visible";
		me.style.height="50px";
		document.addevent.fotoframe.value="yes";
	}
	else {
		me.style.visibility="hidden";
		me.style.height="0px";
		document.addevent.fotoframe.value="";
	}
}

function enableAnders()
{
	var currentValue = document.getElementById('soort').value;
	var me = document.getElementById('namelijk');
	
	if (currentValue == 'Anders')
	{
		me.style.visibility="visible";
		me.style.height="25px";
		document.addevent.anders.disabled=false;		
	}
	else
	{
		me.style.visibility="hidden";
		me.style.height="0px";
		document.addevent.anders.disabled=true;
		document.addevent.tag3.value=currentValue;
	}
}

function andersTag()
{
	var currentValue = document.getElementById('anders').value;
	
	document.addevent.tag3.value=currentValue;
}

function enableVoorwaarden()
{
	if (document.addevent.voorwaarden.checked)
	{
		document.addevent.voorwaarden.value="akkoord";
	}
	else
	{
		document.addevent.voorwaarden.value="";
	}
}

function enableNieuwsbrief()
{
	if (document.addevent.nieuwsbrief.checked)
	{
		document.addevent.nieuwsbrief.value="akkoord";
	}
	else
	{
		document.addevent.nieuwsbrief.value="";
	}
}
	
function enableLangdurig()
{
	if (document.addevent.langdurig.checked)
	{
		document.addevent.langdurig.value="1";
	}
	else
	{
		document.addevent.langdurig.value="";
	}
}