I need a html code for a basic mmo?

You can't make an MMO in HTML. At the very least, you need a client-side programming language (HTML is a markup language, not a programming language)- either Javascript with Canvas, a Flash app, or a Java applet as well as a server side program- probably written in Java, Python, Ruby, or potentially even C/C++. There's no such thing as a "simple" game.