JQuery :: Trigger To Show 2 Divs ONLY When A Another Div Is Shown?

I am modifying some code. Unfortunetly, some of it is dependent on "other" code I don't have access to.

In a nutshell.

I have something like...

Code:
<div id="topnoshow" style="visibility: hidden;">some top content</div>
<div id="actiondiv" style="visibility: hidden;">

This div shows when some data is returned by the app. We have some js that grabs etc.. formats it etc.. and finally shows this div (see below).

</div>
<div id="bottomnoshow" style="visibility: hidden;">some bottom content</div>

So, those three divs are hidden, but the middle div is generating data etc... and eventually it will show (or maybe not).. BUT, I only wanna show these divs:

topnoshow
bottomnoshow

WHEN actiondiv is show(). I can't use a periodic executor OR add some code to the file that determines when to show "actiondiv".. but there is an event trigger set (see below).

The CODE I CAN'T MODIFY HAS THIS:

Code: jQuery('#actiondiv').trigger('actionmodule:loaded');

Can I somehow, in my file, do something off of that event? .trigger('actionmodule:loaded')