function Validate()
{
	var errormsg = "";
	if (document.form_afspraak.name.value == '')
	{
		errormsg += "naam is verplicht\r\n";
	}
	if (!checkMail())
	{
		errormsg += "email is niet correct\r\n";
	}
	if (document.form_afspraak.tel.value == '')
	{
		errormsg += "telefoonnummer is verplicht\r\n";
	}
	
	if (errormsg == '')
	{
		return true
	} else {
		alert(errormsg);
		return false;
	}
}
function checkMail()
{
	var x = document.form_afspraak.email.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x)) return true;
	else return false;
}