This is just a rough example. Check out some of the tutorials on Modules

package <path>::CommonModule;

use strict;

sub new {
  my $self = bless({}, shift);

  ## So you could parse a multiple-valued hash if needed
  for (my $i=0; $i<@_; $i+=2) {
    defined($_[($i + 1)]) || die("CommonModule called with odd number 
+of parameters");
    $self->{$_[$i]} = $_[($i+1)];
  }
  return $self;
}


sub process_data {
  my $self = shift;

  ## something similar to your current cgi script processing

  my $form_item = $self->{formdata}->param('formname');  # get the for
+m data
  ...  
  ...
  my %templ_hash = (
    #just like you would create your template hash
    ...
  );    
  return %templ_hash;
}

1;  # Don't forget to add this.
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