+sub page_to_id ($) {
+ # Converts a comment page name into a unique, legal html id
+ # addtibute value, that can be used as an anchor to link to the
+ # comment.
+ my $page=shift;
+
+ eval q{use Digest::MD5 'md5_hex'};
+ error($@) if $@;
+
+ return "comment-".md5_hex($page);
+}
+