var wiped_elements = {};

//Elements that use these functions each require an id
function wipe(element) {
	if (!(element.id in wiped_elements)) {
		wiped_elements[element.id] = element.value;
		element.value = '';
	}
}

function fill(element) {
	if (element.value === '' && (element.id in wiped_elements)) {
		element.value = wiped_elements[element.id];
		delete wiped_elements[element.id];
	}
}