I need help with Admin Control Panel modification

[user 1-2-3]

I want add plugin to "Threads Awaiting Moderation" and "Posts Awaiting Moderation" tables. I want to add some Javascript there, but can't find what to edit.

Actually I don't want code modification, but I don't know how to do this through plugins system.

Exactly what I want:

<textarea name="threadpagetext[10]" id="ta_threadpagetext[10]_1" rows="15" cols="70" wrap="virtual" dir="ltr" tabindex="1">Some text</textarea>

Change to:

<textarea name="threadpagetext[10]" id="ta_threadpagetext[10]_1" rows="15" cols="70" wrap="virtual" dir="ltr" tabindex="1">Some text</textarea> <input type="button" value="AAA -> Aaa" onClick="javascript:changeCase(this.form.elements['threadpagetext[10]']);">

Any help will be appreciated.