Problems adding an external class

Hello,

i am trying to add an external junit 4 class (no source, just the class file) to my project. I add an external Class folder from the Project/Properties/Libraries window. When i run the class it complains that it cant find any of the classes in the rest of the project. am i missing anything here.

Note if i add all the projects in this external class folder it runs successfully so i know nothing is wrong with this junit class.

your help is appreciated.

just a correction on my description when i add the classes from the project to the same external class folder it runs successfully however i am guessing i should not have to do this and instead use the eclipse gui to do the class properly

also i want pointout that the package name in the external class is different than what is used in the project which is probably behind the issues i am having