how do I use a hash of hashes reference to a function ?

[Anonymous Monk]

I've got several hash of hashes, i.e. :

$hash{name} = { date => "09-22-00", city=>"Chicago",};

I want to pass this to a function like this:

function (\%hash);
function (\%hash1);
function (\%hash2);

sub function 
{
# now I want to use the reference to access the hash I just
# passed, but I'm not sure how. I need to add items to the 
# hash of hashes as well.
# this will flatten the hash, I'd prefer to just know the
# name of the hash I just passed
%hash_reference = @_; for $key (keys %hashreference){
  $hashreference{$key} ={moredata=>"datadatadata"};
}
}