ia32-libs-libnss3 unmet dependencies

I run Debian squeeze with debian-multimedia and backporst as extra
repositories. When I try to install ia32-libs-libnss3 I get the
following error message, how can I fix this?

The following packages have unmet dependencies:
 ia32-libs-libnss3 : Depends: ia32-libs (>= 1.19) but it is not going
to be installed
                     Depends: ia32-libs-libnspr4 but it is not going
to be installed