IM Transparency: transparent when active, more when inactive

[lacir]

The topic says it all. I like to have my IM window a little transparent when i use it so i can type and still see whats happening in the background a bit. I also would like it even more transparent when it is not active. I believe if you have the functionality to enable or disable solid when active, when you have it unchecked then you should have more options for active visibility and inactive