I want to develop a web-based java applet that will run inside a web browser. It will be more or less a chat room kind of thing.

I made the client/server in VB but now I want to make a web-based client so people can chat from their web browser.

I know nothing about JAVA at all but I can learn from tutorials and whatnot.

But I don't know where to start. What (SDK?) development environment/software do I download? Where do I get it?