Thanks for your reply.
The detail page set must be sorted in the same order as the master page set, so that when the user clicks 'next item' on detail page, it will correspond with the next item that they saw on the master page? Am i missing something here?
Also, could you let me know if i need more than the two recordsets you mentioned? And if so, what they are. (presumably i need a 'current item' recordset. Would that be filtered on 'itemid')
Apologies for all the questions.