function clearInputIfEmpty(el, message) {
	if (el.value == message) {
		el.value = '';
		el.style.color = 'black';
	}
}

function clearInputIfEmptyByElId(elId, message) {
	var el = document.getElementById(elId);
	clearInputIfEmpty(el, message);
}

function showMessageIfEmpty(el, message) {
	if (el.value == '') {
		el.value = message;
		el.style.color = 'grey';
	}
}

function escapeText(text) {
	return text.replace(/ /g,'-');
}