[Zope] Using an external method into another external method

Let's say I have two external methods (foo1 and foo2) in two different files (myFile1 and myFile2 respectively) on my Extensions folder. I would like to import foo1 into the myFile2 where foo2 is. I have tried: from myFile2 import foo2 from Extensions.myFile2 import foo2 but it doesn't work. It says that Either myFile2 or Extensions doesn't exist. I don't want to put them in the same file because foo1 is called several times inside myFile1 and foo2 is called several times in myFile2. So, I would have to join both files into one and it wouldn't be an elegant solution. Does anybody have any idea? Thanks in advanced, Josef.