Boxy not working on Firefox

[mj]

I am working on a facebook like messaging system where in I load a
message form through ajax (it takes a lot time to load).
I have form buttons to send and cancel. On SEND, I need to validate on
serverside and show error if any on same form popup. Each click on
SEND I recall the entire message page through ajax. But after 2 times,
the send button won't work.
Kindly tell me what could be the problem and how can I get through
this.
Also, when I use Boxy.get(this).hide() in a jquery event like below,
it doesn't work. the element is also placed within the same popup
dialog box.
$('#element').click(function(){
Boxy.get(this).hide();
});