Check the site, specifically the Bitstrips for Schools, and set up a class account when you're ready. Experiment first yourself with the site, creating a comic strip you want to share with your class. Your students can view it on the website, or once you start a class blog, you can embed your creation there, as I am here. Use the arrow keys to move through the panels.
You can also do a screen capture and display the full comic as an image.
In the meantime, I've set up a class account, so just let me know when you want to start experimenting, and I'll give you the access code.