Hm, doh :D
Go to the
Public Layers page. Find your layout, open the raw code, and copy everything.
In another tab, open
Your Layers. Create a new top-level layer, type layout. Edit it and paste the LJ public layer inside, deleting what's already inside. Save and compile.
If you get compilation errors, get back at me and tell me which layout you're trying to transfer. If you don't, get back at me and I'll explain what you need to do next.