Photoshop :: How Do I Keep Only The Layer Style?

I added inner and outer glow and a drop shadow to an image. Now I want to keep only the glow and shadow parts but delete the rest of the image so it is transparent. Is there an easy way to do this?


Here is more detail about what I am trying to do if it helps. I want to make a team photo of video game characters I have trimmed out individually. When you mouse over them they highlight in the glow effect. I have done this by making background photo with the entire picture with all the characters already added.

Then I have CSS hover attributes that cover each character with another version that has the glow effect. I am not sure this is the best way but it works. My problem is the multiple png files add up quickly. If I could trim out all the detail and just keep the outline glow I think the file size would easily cut in half or more for each character.