I try this http://chaldee1.gotadsl.co.uk/~richa...ight=mask+mark

but when I key the black - i have the problem that it will key the input too.

I look for a solution - :
Layer 1: Background
Layer 2: Liveinput
Layer 3: Mask for liveinput

or

Mix 1
Layer 1: Background
Layer 2: Mix 2


Mix 2:
Layer1: Liveinput
Layer2: Mask


hope you understand me.