SQL & PL/SQL

I have the following type

    type TVarcharArr is table of varchar(4000) index by binary_integer;

I have a procedure that passes in two separate arrays as:

    p_account_number                 in TVarcharArr,
    p_product_system_code          in TVarcharArr

These arrays are related (they will have the same number of elements), the contents would be as follows:

    Account Number    Product System Code
    123                      ABC
    456                      DEF
    789                      GHI

I can use TABLE(CAST to turn each of these arrays into a table, but how do I join these two arrays together so that they become a single table with two columns? Or if I CAST them as TABLEs, how can I join these two tables together - is there some way of using the index to facilitate the join?

Cheers

Richard