Missing jQuery 1.4 source file

Seemed to be missing from the demo.htm file.
Added label re-routing

If there is a label before/after the TEXT input control you can click on
it to give focus to the TEXT input.

However this would be lost when the dropdowns [visually] replace the
textbox.

Added enhancement which looks for a related label control and updates
it's FOR attribute to be the first dropdown (usually the day).

Clicking on the label now gives focus to the dropdown.
Added associated time dropdown plug-in

I needed a version that did the same for the time as well as the date.

Follows similar pattern to your date version.  Would seem sensible to
add back into your library in case anyone else finds it useful.

Added a demo file so you can see it in action.