Any help on this one would be great!

I need to be able to sort an array of lists by specific columns.

For example, I need to sort @data by: $data[][$cols{FIRSTNAME}], $data[][$cols{LASTNAME}], $data[][$cols{ADDRESS}], etc where $cols is a hash pointing me to the correct column index in @data. Everything I have found with regards to sort is only on simple arrays....

Thanks for your help!