function dg(elementid) {
	return document.getElementById(elementid);
}
function checkEmptyField(fieldName) {
	var emptyString = /^\s*$/ ;
	if(emptyString.test(dg(fieldName).value)) {
		dg(fieldName).style.border = "1px solid red";
		return true;
	} else {
		dg(fieldName).style.border = "";
		return false;
	}
}
function checkEmailField(fieldName) {
	var emailString = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
	if(!emailString.test(dg(fieldName).value)) {
		dg(fieldName).style.border = "1px solid red";
		return true;
	} else {
		dg(fieldName).style.border = "";
		return false;
	}
}
function validateNieuwsbrief() {
	var errs = 0;
	if(checkEmptyField("email_aanmelden")) { errs += 1; }
	else if(checkEmailField("email_aanmelden")) { errs += 1; }
	return (errs==0);
}
function validateNieuwsbriefDetail() {
	var errs = 0;
	if(checkEmptyField("email_detail_aanmelden")) { errs += 1; }
	else if(checkEmailField("email_detail_aanmelden")) { errs += 1; }
	return (errs==0);
}