var reg_email = /^(.+)\@(.+)\.(.+)$/

	function sprawdz_formularz() {
	
		f = document.forms['praca'];
	
		if (!f.elements['imie_nazwisko'].value.length) {
			alert("Please enter your first and second name!");
			return false;
		}
		
		if (!f.elements['adres'].value.length) {
			alert("Please enter your address!");
			return false;
		}

		if (!f.elements['telefon'].value.length) {
			alert("Please enter your telephone number!");
			return false;
		}

		if (!f.elements['email'].value.length) {
			alert("Please enter your e-mail address!");
			return false;
		}
 		
		if (f.elements['email'].value.search(reg_email) == -1) {
			alert('Invalid e-mail address!');
			return false;
		}

		return true;
	}