Spoof username and password help

Anyone have some code that will allow me to have username/password fields on a page that when someone enters info, it looks like it's working, and then says "username/password not found" like typically seen?

I thought I posted this yesterday but can find my post. Could it have been deleted? -- hope I'm not breaking a rule

What exactly would be the point of that? It may be easier to figure out what you want or a workaround if you give us an example in context. As of now it seems pointless. You could use an iframe of another sites login and ofcourse ur users would likely not have signed up with them.

No, I don't need an I-frame -- There's no offer attached to it at all. It's just to make a sight appear more "official".