function checkNaam(){
	if(document.forms[0].naam.value=="") {
		alert("Vul a.u.b. uw naam in.");
		document.forms[0].naam.focus();
		return false;
	} return true;
}

function checkMail(){
	if(document.forms[0].email.value==""){
		alert("Vul a.u.b. uw email adres in.");
		document.forms[0].email.focus();
		return false;
	}
	if(document.forms[0].email.value.indexOf('@')==-1 || document.forms[0].email.value.indexOf('@')==0 || document.forms[0].email.value.indexOf('@')==(document.forms[0].email.value.length-1)){
		alert("Het email adres is niet correct.");
		document.forms[0].email.focus();
		return false;
	}
	if(document.forms[0].email.value.indexOf('.')==-1 || document.forms[0].email.value.indexOf('.')==0 || document.forms[0].email.value.indexOf('.')==(document.forms[0].email.value.length-1)){
		alert("Het email adres is niet correct.");
		document.forms[0].email.focus();
		return false;
	}
	return true;
}

function verstuur(){
	if(!checkNaam()) return;
  if(!checkMail()) return;
	
	document.forms[0].submit();
}