if it is a folder in order for the above to work it should be a folder named startPanel and have inside a file named init.py which will contain all your code or import the module that contains your code. Or else it wont work. Read on python packages to understand why.
by the way you naming convention is not good, it better that the name of the folder to be start_panel and of course the same name should be used in your import commands and imp.reload
first the modules should be in one blender path used for python modes
Dokuments ins not in that path unless you added it in the preferences
Second, you totally ignored my reply on how to use and call a package because if you did you will be importing like this
from packageName import file1
and I told you to read on python packages , or else you will be hitting your head against the wall. Coding is all about reading , and reading and reading and reading and if you made sure you have read all then read some more and then finally code. This is how we all learned, no way to go around it.