jquery (ui) integration library approach

[eluser]xwero[/eluser]
the people at EL are working on their own javascript library but choice is always good.

The problem with these libraries is that it's only useful for a few basic actions and you have to maintain it to keep it up with the javascript library changes.

I see a few problems with your library as you shown here. What if the developer of the site uses a custom jquery ui which doesn't contain the datepicker? i would use the Google AJAX Libraries API urls for jquery and jquery UI.
You assume the datepicker field has an id but i think it's more likely the datepicker field is recognized by a class because it's common to have more than one field in a form that uses the datepicker, for example a form where the begin and end date needs to be inputted.