my ($mainsort) = grep { /^$form->{mainsort}$/ } @databasefields;
my ($subsort) = grep { /^$form->{subsort}$/ } @databasefields;
die "illegal parameter for mainsort or subsort" unless $mainsort and $subsort;
my ($mainsort) = grep { /^$form->{mainsort}$/ } @databasefields;
my ($subsort) = grep { /^$form->{subsort}$/ } @databasefields;
die "illegal parameter for mainsort or subsort" unless $mainsort and $subsort;