mailmask for Apache works on server side and converts e-mail address from text to image on the fly. If you want to convert html files on local drives, try to use mailmask for Windows.

Installation
(1)Install gd and GD.pm
(2)Download mailmask for Apache and decompress it.
(3)Place mailmask.pl to your cgi-bin directory.
(4)Open mailmaskcvt.cgi, edit following pxarameters and place it your cgi-bin directory.
     (A) Directory that store image files of e-mail addresses.
     (B) Format of image files.
     (C) Font size of e-mail address.
(5)Open configuration file of Apache(e.g. /etc/httpd/conf/acecss.conf) and append following sentence.

 

#for mailmask <Directory /home/httpd/html/yourdirectory(*1)> Action text/html http://www.yourdomain.com/cgi-bin/mailmaskcvt.cgi(*2)> </Directory>

(*1) Directory that you want to apply mailmask
(*2) URL for mailmaskcvt.cgi that you installed in (3).