function spr_kontakt(forma) {
	if (forma.email.value.length>0) {
		wzor=/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
		if(wzor.test(forma.email.value)==false) {
			alert('Pole \'Email\' posiada zły format!');
			forma.email.focus();
			return false;
		}
	}
	else return true;
}