Multiple selects but each has the same disabled items

[StateBarofArizona]

In my scenario I have a single list of presenters (pulled from a database). On my form I have multiple fields the presenters can be assigned to. For example, I have a list of sponsors, a list of chairs, a list of faculty, a list of moderators, etc.

Form looks something like this:

dropdown: Select a presenter
multiselect; John, Sam, Dave

dropdown: Select a presenter
multiselect: Sally, Sue, Bill

If I pick a name from the first dropdown list, I need it to appear in the first multilist, AND not only be disabled in the first dropdown list, but all lists on the page. So to say it another way, a presenter can only be on one list (sponsor, chair, etc.).

How can I keep all the dropdowns in sync?

[vicb]

Just as you would do without bsmSelect.