function chooseBy (by) {
	var fm = document.theform;
	for (var i = 0; i < fm.by.length; i++) {
		if (fm.by[i].value == by) {
			fm.by[i].checked = true;
		}
	}
	searchChange();
}

function getRadioValue (el) {
	for (var i = 0; i < el.length; i++) {
		if (el[i].checked) {
			return el[i].value;
		}
	}
}

function searchChange () {
	var fm = document.theform;
	if (getRadioValue(fm.by) == 'phone' || fm.country.value != 'uk') {
		document.getElementById('gap').style.display = 'none';
		document.getElementById('postcode').style.display = 'none';
	} else {
		document.getElementById('gap').style.display = '';
		document.getElementById('postcode').style.display = '';
	}
}

window.onload = searchChange;