Add Infinite Scroll to Ajax Loaded (Wordpress) Category Query -- 2

Following a few different online tutorials, I've managed to create a function to modify my WordPress post display via Ajax based on a category selected from a drop-down menu. I'd now like to add Infinite Scroll to the Ajax loaded content, and I can't seem to figure out what to do for that. Would some help. See more details here: [login to view URL] Is this something you can complete for me? Thanks in advance.