jQuery to store initial value of textarea

In the script below, I want to keep the initial value of htmlStrTOCpre static so that it does not change. However, once I edit the text area, the undo will no longer paste the original text back into the textarea. I believe its because the htmlStrTOCpre is based on the html() of textarea at the time the undoTOC function is called, and not the initial value on page load. How can I store that initial value, so that I can always paste it back into the textarea (via the undoTOC function)?

Table of Contents

Paste TOC | Undo

http://localhost:8888/test/

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