Greasemonkey script in Firefox 4, want to change one line of code on webpage

Alright, I will try to make this is as simple as possible, without being too vague. I want to change one of line of code on a webpage in hopes of preventing a preview pane from appearing. Original line of code
I want to replace the above line with
I have previously written one Greasemonkey [script][1] but unfortunately I am have having difficulty applying the techniques learned from that script into this new one, thus this post. cheers
-Chris [1]: http://ipatch.penguinmilitia.net/greasemonkey-scripts/
You could probably use Stylish to achieve the same effect. I think the CSS would be #previewpane { display: none !important; } assuming that the previewpane-hide class does what I assume it does...

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