Novice: Add button to do mailto

[dsmcd01]

Hello...

I'd like to add a button to do a mailto. So far I have

PHP Code:

<form action="mailto:john@doe.com"> 
<input type="image" src="$stylevar[imgdir_button]/email.gif">
<input type="hidden" name="subject" value="Here's the email subject">
<input type="hidden" name="body" value="Here's the email body">
</form> 

but the spaces in the subject and body are replaced by '+'.

"Here's+how+the+text+in+subject+and+body+looks ".

Any suggestions?

Thx,
D.