Change ad_thread_first_post_content CSS?

[RedTurtle]

I am trying to get some code to show up when a user is using adblocker on my site.

The problem is that the vBulletin CSS for the template ad_thread_first_post_content keeps getting blocked by the adblock extension itself.

I am trying to rename the <div id="ad_thread_first_post_content"> to remove the word 'ad' (so that it does not get blocked by adblock) but when I rename that div ID and then make the changes to the css in vbulletin-chrome.css and in showthread.css (renaming all instances of #ad_thread_first_post_content in both files) and what ends up happening is that the entire template no longer loads on the showthread page.

Is there any correct way to rename this div and all the css references to it?

Thank you!