Encoded email : page changed without consent !

Hello,

I made some links mailto with FCKEditor. The encoded way seems great, but the links change the page to something like that "mailto:test@test.com?" before opening outlook or other e-mail application .
I think it's because of the location.href=xxx and I understand : it is for not using <a href="mailto" ..

How can I change that ?

Or if I change the EMailProtection to "none", how can I easily crypt the emails with PHP ?
I got this way :

<style type="text/css">  
p span.displaynone { display:none; }  
</style>  
<p>ddd@<span class="displaynone">null</span>dd.com</p>

but it's not good with links like

<a href=mailto:ddd@dd.com>ddd@dd.com</a>

because I made a function wich replaces all the @ by

@<span class="displaynone">null</span>

and it becomes ugly on screen, if you can imagine (closure of the <a> too early)

Thanks guys if you have any ideas.

K.