ya, ya, ya, jogl is always a bitch to set up, but when you do end up getting it working, its amazing.
What you may have to do:
1.) make sure its in build path of project (You implied this, so were good)
2.) Go to the "Run..." option in eclipse (top of window) and add to the Arguments tab the VM argument -Djava.library.path=---LOCATION OF LIBRARY DIRECTORY---
If it still doesnt work, right click My Computer, go to Advanced, go to Environmental Variables, go to Path, go to Edit, APPEND on to the end of the line --LOCATION OF LIBRARY DIRECTORY-- and a SEMICOLON
jogl is a bitch to install