function validate_newsletter_form() {

	var frm = document.getElementById('newsletter');
	
	validity = true; // assume valid
	msg = "";    

	if (!check_email(frm.email.value)) {
	   validity = false; msg+="A.u.b. een correct E-mailadres\n";
	}	
	
	
	if (!validity) {
		alert(msg);
		return validity;
	} else {
		frm.submit();
	}
	function check_empty(text) {
	  return (text.length > 0); // returns false if empty
	}
	function check_email(adres) {
		if ((adres == "") || (adres.indexOf ('@') == -1) || (adres.indexOf ('.') == -1) || (adres.indexOf (' ') != -1)) {
			return false;
		}
		return true;
	}
	
}

function checkfocusnewsletterfield()
{
	searchfield = document.newsletter.email;
	searchfield.value = "";
}