NetCommunity - fix acknowledgement page after donation

One of the retrograde steps (in my opinion) that was made to Blackbaud NetCommunity at one of the previous upgrades was to make it so that after someone had given they were kept on the same page, but that the donation part was replaced with some acknowledgement text. So before they gave it would look like this:

Please give!

Amount: ___

Name etc.

and then after

Please give!

Thanks for giving etc.

I thought this was impossible to fix with Javascript because I couldn't find a way to get a script to fire while the acknowledgement is displaying. However there is a workaround on the Knowledgebase. The workaround it gives only works if you have one text part on the page. However if you have more than one text part at the top of the page you can use a class to do this instead of an id so you have:
Then in the HTML for the custom acknowledgement put this:

Another problem with this change is that you can easily see Google analytics for after people have given, so if anyone has any tips, please share.