Sorry, I didn't notice that div before. Now that I see how you have your 'backgrounds' set up, you could use the following code:
$('#brand-bg, #inspiration-bg, #main-bg').css("display", "none");
To be fair though, I don't really like this as a 'solution' because it doesn't scale very well with any potential changes or future updates (as I have the background IDs directly coded into part of this). But it should get the job done.