function checkNieuwsbrief(formulier)
{
	if(formulier.name.value=='' || formulier.name.value=='- naam opgeven -' || formulier.name.value=='- enter name -')
	{
        alert("You need to enter your name.");
        formulier.name.focus();
        return false;
    }
    var mailre = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    if(!formulier.email.value.match(mailre))
    {
        alert("You need to enter a valid e-mailaddress.");
        formulier.email.focus();
        return false;
    }

    formulier.submit();
}
function checkContact(formulier)
{
	if(formulier.aanhef.selectedIndex==0)
	{
		formulier.aanhef.focus();
		alert("You need to select your title.");
		return false;
	}
	if(formulier.voorletters.value=='')
	{
		formulier.voorletters.focus();
		alert("You need to fill in your initials.");
		return false;
	}
	if(formulier.achternaam.value=='')
	{
		formulier.achternaam.focus();
		alert("You need to fill in your surname.");
		return false;
	}
	var emailregex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z]{2,6})+$/;
	if(!formulier.email_from.value.match(emailregex))
	{
		formulier.email_from.focus();
		alert("You need to fill in a (valid) e-mailaddress.");
		return false;
	}
	if(formulier.telefoon.value=='')
	{
		formulier.telefoon.focus();
		alert("You need to fill in your phone number..");
		return false;
	}
	if(formulier.contact_methode.selectedIndex==0)
	{
		formulier.contact_methode.focus();
		alert("You need to select a contact method.");
		return false;
	}
	if(formulier.reactie.value=='')
	{
		formulier.reactie.focus();
		alert("You need to fill in a message.");
		return false;
	}
	formulier.submit();
}