1. Go to you home directory
2. Open the file .idl_startup with a text-editor
3. Add a line into .idl_startup
		ssw_path,'/home/dana/idl/',/prepend
   This line adds /home/dana/idl/ into the beginning of the IDL's path list. 
4. Save .idl_startup
5. Enter sswidl and try to run display.pro again.
6. Let me know if you have problems.