Cambios

<label><input type="checkbox" id="roundtrip" nameonclick="roundtriproundTripToggle()" valuename="RoundTriproundtrip" />Is a round trip</label>

jQuery( document ).ready(functionroundTripToggle() { $('#roundtrip') var theForm = document.click(function(){forms["calculator"]; if (thistheForm.elements["roundtrip"].checked) { $('input#descenso') divobj.css('display', 'none')innerHTML = "Total time:"; }}) });