Mouse Over on top of Mouse Over - Help Please

Hi,

Basically what I have is a green block that fades to 20% when you mouse over it, then a blue block on top of the green that changes to red when you mouse over it.

What I would like is when I mouse over the green it changes to 20%, then when I mouse over the blue is changes to red (whilst keeping the green faded).

However what I am getting is when I mouse over the blue, it then thinks that the green has been moused out.

Any suggestions? I’ve attached the file.

Cheers!