function versturen(){
	if(document.forms['form1'].naam.value==''){
		alert('You forgot to fill in your name');
		document.forms['form1'].naam.focus();
		return false;
	}
	if(document.forms['form1'].adres.value==''){
		alert('You forgot to fill in your address');
		document.forms['form1'].adres.focus();
		return false;
	}
	if(document.forms['form1'].woonplaats.value==''){
		alert('You forgot to fill in your city');
		document.forms['form1'].woonplaats.focus();
		return false;
	}
	if(document.forms['form1'].land.value==''){
		alert('You forgot to fill in your country');
		document.forms['form1'].land.focus();
		return false;
	}
	if(document.forms['form1'].tel.value==''){
		alert('You forgot to fill in your telephonenumber');
		document.forms['form1'].tel.focus();
		return false;
	}
	if(document.forms['form1'].email.value==''){
		alert('You forgot to fill in your e-mail');
		document.forms['form1'].email.focus();
		return false;
	}
	if (document.forms['form1'].email.value.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) == -1) {
		alert('You did not fill in a valid e-mail');
		document.forms['form1'].email.focus();
		return false;
	}
	if(document.forms['form1'].bericht.value==''){
		alert('You forgot to fill in a message');
		document.forms['form1'].bericht.focus();
		return false;
	}
	document.forms['form1'].submit();
}

function validatetel(field) {
	var valid = "0123456789-+"
	var ok = "yes";
	var temp;
	for (var i=0; i<field.value.length; i++) {
		temp = "" + field.value.substring(i, i+1);
		if (valid.indexOf(temp) == "-1") ok = "no";
	}
	if (ok == "no") {
		alert("Please fill in a number.");
		field.focus();
		field.select();
	}
}