function enableDisableKmFields(kmIllimited) {
	if ($F(kmIllimited)==1) {
		Element.hide('km_to_cover_container');
	} else {
		Element.show('km_to_cover_container');
	}
}

function enableDisableCCFields() {
	ccTypeValue = $F('cc_type');
	if (ccTypeValue=='-1') {
		Element.removeClassName('cc_number', 'required');
		Element.removeClassName('cc_validity_mm', 'validate-select-field');
		Element.removeClassName('cc_validity_yyyy', 'validate-select-field');

	} else {
		Element.addClassName('cc_number', 'required');
		Element.addClassName('cc_validity_mm', 'validate-select-field');
		Element.addClassName('cc_validity_yyyy', 'validate-select-field');
	}

}

function showPlusMinus(refDiv) {
	if ( Element.visible(refDiv) ) {
		Element.update('loginPlusMinus', '(-)');
	} else {
		Element.update('loginPlusMinus', '(+)');
	}
}

function enableDisableCompanyFields(rent_form, company_option) {
	var form = $(rent_form);
	var company_value = form.elements[company_option][0].checked;
	//alert(company_value);
	var company_fields = $$('.company_fields');
	if (company_value==true) {
		$('text_cf_piva').update('Partita IVA');
		company_fields.each(Element.show);
	} else {
		$('text_cf_piva').update('Codice Fiscale');
		company_fields.each(Element.hide);
	}
}