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if (-s "$imagefile" < 700_000_000 and -e "$imagefile") {
        print '<script language="JavaScript">
...

( $? == 0 ) ? &success($date, $time, $hostname, $logdir, $to, $from) :
&failure($date, $time, $hostname, $logdir, $to, $from);

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eval {
  foo() or die "foo failed";
...
    # deal with unexpected error
  }
}