create a keypair on the server

[Dunihlav]

I would like to ask for recommendations about creating a valid keypair(private and public key) or btc wallet. I know there are some offline wallets and some online wallets, but dont know how to connect it with it. Any tips?

What i want to is show public and private key on my webpage and let user to print it out that noone else will see this, but dont know what is the best way to create this keypair.

Hope i explained myself and someone will show me the way.

[Dunihlav]

I was reading that, but im not sure if it is safe. I read about brainwallet that it was hacked or something.

But there are different types of wallet on this webpages, so is it safe to do it that way as it is in javascript>?