In firefox 3 and prior versions, we were able to make the header on a sortable, scrollable table stay fixed and not scroll out of site when we scrolled the table, by putting the table in a div, and using css to indicate that the div should use overflow:auto and overfow-x:hidden. The tbody also used overflow:auto and overflow-x: hidden. The thead used position:relative. For the sort to work correctly the thead and tbody must be contained within the same table.