I am working on something like this:

On a webpage, there is an article wrapped in a DIV, an Edit button. When a user click on the Edit button, insert an textarea via javascript, load the html of the DIV into the textarea, load and initial tinymce. When the user click on the Save button, save and update the article via ajax, and destroy tinymce completely.

The problem is that, I failed to destroy tinymce completely. When the user click on the Edit button again, a new tinymce instance will load while the old instance is just hidden.

BTW, I am using the jQuery version of tinymce