function updateForm() {
	var formId = document.contactform.contactid.value;
	var gw = document.getElementById("gebeldworden");
	var am = document.getElementById("afspraakmaken");
	var ia = document.getElementById("informatieaanvraag");
	var av = document.getElementById("algemenevraag");
	var submitbutton = document.getElementById("submitform");
	
	gw.style.display = "none";
	am.style.display = "none";
	ia.style.display = "none";
	av.style.display = "none";

	switch(formId) {
		case "1": gw.style.display = "block"; break;
		case "2": am.style.display = "block"; break;
		case "3": ia.style.display = "block"; break;
		case "4": av.style.display = "block"; break;
	}

	if (formId!="0") submitbutton.style.display="block"; else submitbutton.style.display="none";
}

function toggleAnswer(event) {
	if (!event) var event = window.event;
	if (event.originalTarget) var anchorElement = event.originalTarget; else
	if (event.srcElement) var anchorElement = event.srcElement;
	var divElement = anchorElement; while ((divElement.nodeName.toLowerCase()!="div") && (divElement.nextSibling)) divElement = divElement.nextSibling;
	var isVisible = divElement.style.display.toLowerCase()!="none";
	divElement.style.display = isVisible?"none":"block";
	event.preventDefault();
}