Userscripts.org

screenshot added, but could you please be more specific to the @include address ?

I don't like to @include this kind of expression

.tld means any domain/subdomain like .com, .com.br, ...

is it a post of a topic, an scrap or what ?

i hadn't thought to enable it to work on things other than posts.
i'll work on it right now.

the event is not triggered in the /Main# page, so this is not necessary.

Send me some examples of urls. (PM me if you wish)
This might be some problem of internationalization

very good question!
no, the HTML should be disabled.
but if it is enabled, then change <?php to <?php and this should work.

Do you use XPath Checker?
If so, could you please right-click on 2 different posts and copy the xpath to me ?

oh, and please add an alert before any other function call to make sure that this is not a @include problem.

There isn't any <?php in the link you posted.

EDIT:
This example worked to me
http://www.orkut.co.in/Main#CommMsgs?cmm=435589...
The only problem I can imagine for now is the missing <?php

to @require this script you need to add the following to your metadata block:

// @resource       highlight http://shjs.sourceforge.net/sh_style.css?v1
// @require        http://shjs.sourceforge.net/sh_main.min.js?v1
// @require        http://shjs.sourceforge.net/lang/sh_php.min.js?v1
// @require        http://userscripts.org/scripts/source/38981.user.js

It worked to me just fine!

// ==UserScript==
// @name           test
// @namespace      http://gm.wesley.eti.br/orkut
// @include        http*://www.orkut.tld/CommMsgs?cmm=*
// @include        http*://www.orkut.tld/Scrapbook*
// @include        http*://www.orkut.tld/Home*
// @include        http*://www.orkut.tld/Profile?*
// @include        http*://www.orkut.tld/Messages?msg=*
// @include        http*://www.orkut.tld/ProfileT?uid=*
// @resource       highlight http://shjs.sourceforge.net/sh_style.css?v1
// @require        http://shjs.sourceforge.net/sh_main.min.js?v1
// @require        http://shjs.sourceforge.net/lang/sh_php.min.js?v1
// @require        http://userscripts.org/scripts/source/38981.user.js
// ==/UserScript==

// ... no code is needed

i'm sorry.
my script is working.
i said what you need to @require the script

change the position of your actual metadata block to the beginning of the script.
then add the @require'd files

that's all I can do for you.