// JavaScript Document
var msg_text = "De volgende velden zijn niet goed ingevuld of zijn niet geldig:";
var text_1 = "- Naam";
var text_2 = "- E-mail adres";
var text_3 = "- Geen geldig e-mail adres!";

function verify(f){
	var empty = "";
	var e1 = document.thisform.naam.value;
	var e2 = document.thisform.email.value;

	if (isBlank(e1)) empty += "\n" + text_1;
	if (isBlank(e2)) {
				empty += "\n" + text_2;
			} else if ((e2.indexOf("@",0) + 1 == 0) || (e2.indexOf(".",0) + 1 == 0)) {
				empty += "\n" + text_3;
			}
	
	if (empty == "") {
		return true;
	} else {
		var msg = msg_text + "\n" + empty;
		alert(msg);
		return false;
	}
	
}
function isBlank(v) {
	var i;
	for(i = 0; i < v.length; i++) {
		var c = v.charAt(i);
		if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
	}
	return true;
}

function toggleVisibility(id)
{
	options = id.split(",");
	for(i=0;i<options.length;i++) {
		if(document.getElementById(options[i]).style.display == 'block')
			document.getElementById(options[i]).style.display = 'none'
		else 
			document.getElementById(options[i]).style.display = 'block'
	}	
}