Laura, I would not know which of the three is easiest to implement, I never tried the Jquery thing, the other one at tjkdesign.com seems pretty clever and straightforward to me. If you feel unsecure you could try the
SPRY widgets, they are very well documented. Also, they are easy to use from within DW. From the insert panel just choose insert/spry widget/spry accoordion or spry collapsible ...