Changed showCurrentTrip so that a TripObject may containa selector instead of an element for elements that may not exist yet when the Trip is first created
Undoing changes in main index as I have uploaded an example to Dropbox
Improved checkTripData in order to avoid crashes if the element is null, or if the selector didn't match any element in the DOM
Changed order in checkTripData to avoid crashes if sel is null or undefined when asking for length, in case the jQuery returns [] as a result of a not matched selector
Merge pull request #5 from JvrBaena/master

Allow 'sel' property to be a string selector in case the target does not exist when you create the Trip Object