How can I constitute a popup?

[PanPet]

I want to put a small windows on my main page,but I never do this before..
I tryed to learn this from some homepages but,they sad put this
''.......''on main page bla.. bla... But to where?how?
Who can show and teach me?thanks_

 

[DI]

Check out " Spawn "
http://www.jimcoaddins.com/addins.aspx