Javascript OnChange detection for textarea
<p>I have a textarea, a button and some drop down lists.  The user goes through the ddls and answers some questions and I generate text in the textarea based upon the drop down lists.</p>

<p>At a certain point in the questioning, the button becomes visable for submission; I'm not actually submitting the page onclick, I'm doing other client side stuff.</p>

<p>The gist of the question is this: I want the button to disappear (display:none;) if the user attempts to edit the textarea; either directly or through pasting/context menus.  It is okay if the user edits the textarea, but the button is no longer relevant to the application. How do I detect if the textarea is being changed.</p>

<p>Edit: I can't use jQuery.</p>
