Thank you very much for your patience DBear - I really appreciate.
Exactly what I wanted to do so far but unfortunately this doesn’t work… Therefore I thought I have to write more lines of code in order to make this script running properly. The Mac’s email editor won’t open.
All in all this is the final step of my “reCAPTCHA” project. I created some sort of checkbox game to hide the email button. Once a user succeeds all the right images, he/she can email. This test should prevent bots from sending emails. But Google’s reCAPTCHA in fact uses some sort of database request to reveal the actual email address. In order to guarantee a similar result on static websites, I would need some kind of “spaghettification” of my mail address. That’s what I would like to achieve.