[jQuery] Beginner question: AJAX doesn't work

[jQuery] Beginner question: AJAX doesn't work


Hello everybody,
I tried some jQuery AJAX tutorials and got started with jQuery. Moving
further, I got stuck somewhere in my code and I don't know, why. What
I wanna do is simple: give an email address to a php script and
display the script's answer in my page without reloading. so this is
what i