ASCII mask for email address in guestbook/image emails

What this guestbook really needs is a way to mask email address. I have had several spam spiders attack my site now, ripping email address.

Here is an excellant page that demonstrates this

http://digitalcolony.com/02/maskemail/genEmailMask.asp

an email such as webmaster @proxy2.de in ascii html format would read like this to a spam spider

can anyone tell me how to work this into the code for this guestbook

how about the webmaster?