gui design - What controls to fix this Filter?

https://www.scic.com/schedule

I'm looking to replace the filters on the right side of the page and need to know some of the possiblities.

For the date selector, I'm looking at using: http://www.filamentgroup.com/lab/date_range_picker_using_jquery_ui_16_and_jquery_ui_css_framework/

Any other ideas as far as the other criteria is concerned? each of the criteria should also be multiselect.

Needs to be mobile friendly because we are moving that direction.

Answer

How about replacing the accordion with a multiselect box?