Import package from a parent folder

I know it may sound dumb, but a “surfed” alot the net and i didn’t found anything on this,maybe I was doing wrong , anyway:
How can I import a package that is in a parent folder. For example let’s say:
I have a big folder named Main with the Main.fla and a Main.as class. Now I have a 2 subfolders with a package named MPackage1 and MPackage2 and in MPackage1 I have another subfolder(package) named LPackage . What I want is in the LPackage package I want to import a class from MPackage2, how I do that?


package Main—|->package MPackage1->package Package
…|->package MPackage2