1. Make a new layer (Ctrl+Shift+Alt+N)
2. Press ctrl+A
3. Edit>stroke... and add a 3 px black stroke
4. Edit>stroke... and now add a 2 px white stroke
5. Edit>stroke... now an 1 px black stroke
6. Now put the blending mode of the layer on Overlay and you're done
Maybe I'll post some screens later.
//DarkstaR
2. Press ctrl+A
3. Edit>stroke... and add a 3 px black stroke
4. Edit>stroke... and now add a 2 px white stroke
5. Edit>stroke... now an 1 px black stroke
6. Now put the blending mode of the layer on Overlay and you're done
Maybe I'll post some screens later.
//DarkstaR