Exporting Java Program for Web

I've searched around for a while now can I can't find a good bit of advice or tutorials on how to get an Asteroids game I created to run on my website. I have here 4 classes that are packaged together plus an external jar, and when I export it as a runnable jar in Eclipse, it works fine on the desktop. I'm running into roadblocks exporting it as a WAR file, which I believe is what I should use. When I get to the window that says to select "Web project", the list is empty and I can't proceed. I've also read that it needs to be a Java Applet to run on a website, so I have no idea how to convert what I already have into that. I can do Run As > Java Application which works.