function checkEmailAddr(email) {
	var i, iat = -1, idot = -1, iany = -1, c;
	if (email.length < 8) return -1;
	for (i = 0; i < email.length; i++) {
		c = email.charAt(i).toLowerCase();
		if (c == '@') {
			if (iat != -1 || i < 2 || (iany != -1 && i - iany < 2)) return -2;
			iat = i;
			iany = i;
		}
		else if (c == '.') {
			if (i < 1 || (iany != -1 && i - iany < 2)) return -3;
			idot = i;
			iany = i;
		}
		else if ('abcdefghijklmnopqrstuvwxyz0123456789-_+'.indexOf(c) == -1) return -4;
	}
	if (iat == -1 || idot == -1 || idot < iat || i - iany < 2) return -5;
	return 1;
}

function checkEmail(field) {
  if (field.value.indexOf("@") == -1) {
    //alert("Vul a.u.b. geldig E-mail adres in.");
	//document.getElementById('error_email').style.visibility='visible';
	//document.getElementById('error_email').style.display='block';
	field.focus();
	field.blur();
	field.select();
  }
  else {
 if (field.value.indexOf(".") == -1) {
    //alert("Vul a.u.b. geldig E-mail adres in.");
	//document.getElementById('error_emailF').style.visibility='visible';
	//document.getElementById('error_emailF').style.display='block';
	field.focus();
	field.blur();
	field.select();
  }
 }
}

function form_border_on(elemid) {
	if (document.getElementById) {
		if (document.getElementById(elemid)) {
			document.getElementById(elemid).style.borderStyle="solid";
			document.getElementById(elemid).style.borderWidth="2px";
			document.getElementById(elemid).style.borderColor="#db1d1d";
			}
		}
}

function form_border_off(elemid) {
	if (document.getElementById) {
		if (document.getElementById(elemid)) {
			document.getElementById(elemid).style.borderStyle="solid";
			document.getElementById(elemid).style.borderWidth="1px";
			document.getElementById(elemid).style.borderColor="#666666";
			}
		}
}

function form_error_on(elemid) {
	if (document.getElementById) {
		if (document.getElementById(elemid)) {
			document.getElementById(elemid).style.visibility="visible";
			document.getElementById(elemid).style.display="block";
			document.getElementById(elemid).style.margin="0px 0px 0px 0px";
			}
		}
}

function form_error_off(elemid) {
	if (document.getElementById) {
		if (document.getElementById(elemid)) {
			document.getElementById(elemid).style.visibility="hidden";
			document.getElementById(elemid).style.display="none";
			}
		}
}