Multiple dates picker that allows for weekday selection

Multiple dates picker that allows for weekday selection

I'd like to have a datepicker widget that allows for:
multiple date selection
weekday selection, i.e. click "monday" in the calendar and have all
mondays highlighted.
unselecting days that have been highlighted by using the weekday selection
I've looked into Keith Wood's jQuery datepicker and into MultiDatesPickr,
but my JavaScript is very weak and I'm not completely sure of what I have
to do next to extend one of these datepickers and implement this kind of
functionality.
One other option would be to have standard checkboxes outside the input
field, each labeled as a day of the week, and clicking them would
highlight the relevant days in the calendar.
Not sure if it's entirely relevant or useful information, but I'm using
Django 1.5 as the backend and trying to use this as a custom Admin Form
widget.