frame gradient

I have created a red rectangular frame with rounded corners and black fill where a photo will be pasted. I want to create a smooth black gradient on the inner edges of the red frame to give it a 3D effect. Can't figure out how to get a gradient on all four sides. I know it can be done because I have one that I captured from the Net. I can post a portion of that if no one understands what I'm trying to do. (If this site allows posting graphics. This is my first visit, so don't know all the ins and outs.)

Well, you can use the "gradient" fill type in the "stroke" effect, instead of the "solid" fill type,

or you can use the "bevel & Emboss" effect, this is the better way to do what you are trying to achive.

Please post an example...