form_verzonden = 0;
function test(velden) {
	if (velden.email.value.indexOf("@")  == -1  ||
			velden.email.value.indexOf(".")  == -1  ||
			velden.email.value.length         <  6  ||
			velden.email.value.indexOf(" ")   >  0  ||
			velden.email.value.indexOf(",")   >  0  ||
			velden.email.value.indexOf("'")   >  0  ||
			velden.email.value.indexOf("/")   >  0  ||
			velden.email.value.indexOf("\\")  >  0  ||
			velden.email.value.indexOf("<") != -1 ||
			velden.email.value.indexOf(">") != -1 ||
			velden.email.value.indexOf("@") > velden.email.value.lastIndexOf(".")
		) {
		e_mail_ok = 0;
	} else {
		e_mail_ok = 1;
	}

	if (e_mail_ok == 0 && velden.email.value.length > 0 )
	{ alert("Uw e-mailadres is onjuist.");
		velden.email.focus();
	} else

	if (velden.naam.value.length < 2 )
	{ alert("Uw naam ontbreekt.");
		velden.naam.focus();
	} else

	if (velden.telefoon.value.length < 2 )
	{ alert("Uw telefoonnummer ontbreekt.");
		velden.telefoon.focus();
	} else

	{
		if (form_verzonden == 0) {
			form_verzonden = 1;
			return (true);
		}
	}
	return (false);
}