Need tips to create online game

I began creating an online games, online in the sense that it should run from a web browser, with the help of a web application. I immediately thought of Java or Flash to make this game. I like to know if this is possible in C/C++/C# or other. I do not know how to load and execute the browser game. I have never seen that.

That is why I ask you your opinion. I am good in C and Java (so I do not think that migration form C++/C#/.NET is a problem). What do you think what language should I use to achieve this game?

If you are good in Java, than go with Java.

Ideally, you can use any language to code the application server, couple it with languages like flash, javascript or java which will display the data to the player.
If you plan to take shelter then the choice is limited to code the server: Ruby, Python, Perl.

Thank you for your response.

Could you tell me more about the language side coupled client/server. How it happens? What tools/libraries exist in this regard?

Theoretically, the server and the client can be coded in different programming languages because they use something known as "sockets".

Also what do you want more precisely:

-> A multiplayer game, or
-> A single-player game?

Technology and complexity coming out are not the same.

I had already made some basic multi-client program sending a string to the server that redirects it to another client, but I thought it was going to look any further coupling.

Actually I want to make a game, single-player, but to be launched within a browser.