Display listings by category?

Hey!

I created a directory listing that has a category section. I have this set up as a radio button selection (see screenshot: http://cl.ly/1f10153J363n220A3i2z )

I'm wondering what the syntax for listing all the entries of a specific category is? I'm imagining its in the 'where' section.



list($towncenter_eventsRecords, $towncenter_eventsMetaData) = getRecords(array(
'tableName' => 'towncenter_events',
'where' => 'featured = 1',
'limit' => 1,
));

I know the checkbox values are 1 and 0 but wasnt quite sure how the values of the radio buttons were stored. I'm trying to list directory listings by specific categories like this: http://shoptowncenter.com/directory.html

Thanks!