This is the exerpt that I found in the Browser developer's guide for the 4.1 browser found here:
Livelink - Redirection
Tables: The browser supports tables. Users can enable HTML table support to properly display tables that fit
within the screen width of the device. Larger tables are split apart with the table cells displayed in vertical
sequence. Tables cannot be nested within each other.
You should test tables thoroughly in the BlackBerry Browser to verify that they display appropriately on the device.