I took a look and your mouseover function is still working. However, the Responsive image srcset is overriding the image that is displaying. I’m not sure of the best way to fix this with Javascript outside of also including a function to change the srcset images to http://cdn2.hubspot.net/hubfs/492950/Apogee/Icons/Social_Media_Icons/Apogee-website-facebook-hover.png. Using CSS vs onmouseover function should also solve the issue.
