Transaction Check Error, 'downgrade' from 64bit to 32 bit version of FF.

Running Fedora Core 13, 64 bit.
I want to 'downgrade' to 32 bit version to get Flash (I know, no taste :-).

Removed firefox. No problem

$yum install firefox.i686
Gives me a great big dependency list....
then

Transaction Summary
================================================================================
Install      32 Package(s)
Upgrade       0 Package(s)

Total size: 31 M
Installed size: 70 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test


Transaction Check Error:
  package nss-softokn-3.12.4-19.fc13.x86_64 (which is newer than
nss-softokn-3.12.4-17.fc13.i686) is already installed

Error Summary


Yet I can't remove the fc13x86_64 version since it seems to be used all over.

any suggestions please.


TIA


-- 
Dave Pawson
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http://www.dpawson.co.uk