It is easy to use jquery plugin.

Easy way ( 3 step )

1) add jquery and amail plugin.
2) add line in head of your page.

<script>
$(document).ready(function(){
$(’.yourclass’).amail(’(at)’,'(dot)’);});
</script>

if you use wordPress then

1. go to Apperance -> Editor -> header.php
2. add the code before “</head>”

3) Use it

add your email as <a title=”my email” class=”yourclass”>You(at)domain(dot)com</a> it will be as normal link.

jquery plugin source | demo. Try it now | download demo | home page

p.s.  I use the plugin on the page  of  my website.