Welcome
You've come to the right place if you want to swap an image or two! I'm learning all about JavaScript from OzoneAsylum and from Webmonkey's Thau! The webmonkey one is a great tutorial, and Ozone members are awesome for helping you solve coding issues. Thank you so much for your help Ozone!!
Now, here's what you do. See that image up top? It matches the image down here right? Well, run your mouse OVER the image down here and see it change! THEN click the image and see the TOP one change too! Pretty nifty huh? :-)