If you are using Photoshop CS3 or newer, you can go into the layer blending options (select the layer and click on the fx and choose "Blending Options" ). Once you have that open, look for the "Blend if" feature at the bottom. Find the "This layer" slider. Move the right (white) slider towards the middle until the white disappears.
Last edited by andrea; 07-18-2009 at 01:44 AM.