[jQuery] Problem showing a forma with Tiny_mce textarea

[jQuery] Problem showing a forma with Tiny_mce textarea


I have a div wich is showed when the user clicks a button.
The div have a forma with a textarea when tiny_mce is.
But when the form is showed, I cannot write to the textarea and
firefox throws me "t.win.document is null".
In IE works well.
What can I do, I have already tried to do this (http://
blog.mirthlab.com/2008/11/13/dynamically-adding-and-removing-tinymce-
instances-to-a-page/) but doesnt works.
Thanks in advantage.