Get-RId of pop-up window when IM start

Everytime, one login into yahoo IM, there is a big splash window that pop-ups with multiple advertisements or something else. First, the window is very annoying and second everyone just kills that window the moment it pops-up.

One can disable that pop-up through an option *somewhere*. That being default is plain annoying. Make the default to not have the window at all and if someone *really* wants to see the window, they can find the options *somewhere*.