function checkNewsletterForm() {
	var name = document.getElementById('newsl_name');
	var email = document.getElementById('newsl_email');
	if (name.value.length == 0 || name.value.match(/^[\s]+$/)) {
		alert('Naam is niet ingevuld.');
		name.focus();
		return false;
	}
	else if (email.value.length == 0 || !email.value.match(/^(\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,6})$/)) {
		alert('E-mail adres is niet (correct) ingevuld.');
		email.focus();
		return false;
	}
	else {
		return true;
	}
}
function GetXmlHttpObject(handler) {
	var objXMLHttp = null;
	if (window.XMLHttpRequest) {
		objXMLHttp = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) {
		objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	if (objXMLHttp==null) {
		alert("Browser does not support HTTP Request");
		return
	}
	else {
		return objXMLHttp;
	}
}
function updateCacheOpenDays() {
	var xmlHttp = GetXmlHttpObject();
	var url = 'index.php?ajax=1&updateCacheOpenDays=1';
	xmlHttp.open('GET', url, true);
	xmlHttp.onreadystatechange = function() {
		if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
			var response = xmlHttp.responseText;
			if (response == 'OK') {
				return true;
			}
			else {
				return false;
			}
		}
	}
	xmlHttp.send(null);
}
updateCacheOpenDays();