Problems importing org.eclipse modules into pydev project

Im trying to make a script than needs org.eclipse modules like:

org.eclipse.jface.dialogs org.eclipse.core.resources

but when I run the script Eclipse told me th开发者_运维百科at such modules doesnt exist, where I can find them or what can I do to make it work.

Im using eclipse 3.5.1 and Fedora 12

Thanks in advance