function err(form) {

	if (form.meno.value == "") return 1;

	if (form.priezvisko.value == "") return 1;

	if (form.email.value == "") return 1;

	if (form.telefon.value == "") return 1;

	if (form.otazka.value == "") return 1;

	

	var expr = new RegExp(".+@.+");

	if (!expr.test(form.email.value)) return 2;

	
	expr = new RegExp("^0[0-9]{1,11}$");

	if (!expr.test(form.telefon.value)) return 3;

	

	return 0;

}



function formCheck(form) {

	switch (err(form)) {

		case 0 : return true;

		case 1 : alert('Nezadali ste všetky údaje.'); return false;

		case 2 : alert('Chybná e-mailová adresa.'); return false;

		case 3 : alert('Chybné telefónne číslo.'); return false;

	}

}