jQuery Datables Select Filter Modification

I require a modification to the example Datatable shown here: [login to view URL] What I require is to dynamically filter the "select" options to update once the table has been filtered. For example if you select the city of New York, then the "Name select" should update to only show: Brielle Williamson Caesar Vance Cara Stevens etc (11 names in total) And "Position select" should only display the Positions from the New York office etc. And also if a "select" filter is is removed (e.g. City select is set to all), the other "selects" will update to show the increased records from the updated table. I already have the Datatables installed and functioning, I just need this modifcation coded.