#IDを生成する
  use Digest::MD5;
  my $md5 = Digest::MD5->new;

  use Digest::MD5 qw(md5_hex);
  my $idnum = md5_hex($ENV{'REMOTE_ADDR'});
  $idnum = substr($idnum,-4);

  $md5->add($idnum);
  $md5->add($FORM{"bbs"});
  $md5->add(substr($DATE,6,2));
  my $md5datefile = "*************";
  if(-e $md5datefile){
    open(MD5FILE,"<$md5datefile");
    my $md5line = <MD5FILE>;
    close(MD5FILE);
    my ($md5date,$md5number) = split /<>/,$md5line;
    if($md5date eq $MD5DATE){
      $md5->add($md5number);