Erase unused media?

So, I changed my mind a few times about which image I want to use in my program.  So now there are several images loaded into the program that I won't be using.  I'm worried that they might be slowing down the program.  Is there a way to delete old media that you aren't using?



sure, just click the media file you want to delete, a small menu pops up, now click "Delete"

thanks! :)