How to provide name of user while registering

[web3rover]

I want to provide the name of user along with username while registering. Here is the code I am using:

        conn.register.fields.username = document.getElementById("username").value;
        conn.register.fields.password = document.getElementById("password").value;
        conn.register.name = document.getElementById("username").value;
        conn.register.submit();