[PHP] Need help with a login box..

[MuzzyElite]

Hey there,

basically, if you go to http://www.ebobba.net, you can see;

Welcome, Unregistered, to eBobba.net! in the header.

Can anyone provide me with the code to do the following;

• Have a Login Box there that'd fit in that header, replacing the default text, not interfering with the navigation buttons, and the username and password fields not going down, but rather going towards the right if you know what i mean.
• Once they're logged in, the login box is replaced with 'Welcome, USERNAME' to eBobba!

If anyone could, that'd be great

Many thanks