function clearField(id, original_text) {
	var element = document.getElementById(id);
	if (original_text != "" && element.value == original_text) {
		element.value = '';
		element.className = 'text normal-field';
	}
}

function setField(id, original_text) {
	var element = document.getElementById(id);
	if (original_text != "" && element.value == '') {
		element.value = original_text;
		element.className = 'text clear-field';
	}
}