function validateform() {
	for(var i=0; i<fields.length; i++) {
		if (document.f.elements[fields[i]].value == '') {
			alert(fields_info[i]);
			document.f.elements[fields[i]].focus();
			return false;
		}
	}
	if (!validateemail(document.f.elements['email'].value)) {
		return false;
	}
	return true;
}

function validateemail(t) {
	maska = /^[0-9a-z_.-]+@([0-9a-z-]+.)+[a-z]{2,4}$/;
	if (maska.test(t)==false) { 
		alert("Podaj poprawny adres e-mail");
		document.f.elements['email'].focus();
		return false;
	}
	return true;
}

function opensmallwindow(w, h) {
	if (window.smallwindow) {smallwindow.close();}
	smallwindow = window.open('', 'smallwindow', 'width='+w+', height='+h+', toolbar=no, scrollbars=yes')
	smallwindow.focus();
}