function cleanIfIsNotDefaultField(field, defaultValue)
{
	// if not 'this'
	if (!field.value) {	
		var fieldToClean = document.getElementById(field);
	} else {
		var fieldToClean = field;
	}

	if (!empty(fieldToClean)) {
		if (fieldToClean.value == defaultValue) {
			cleanField(fieldToClean);
		}
	}
}