To apply the workaround:
1. Download and run this script:
http://people.debian.org/~bartm/flashplugin-nonfree/ia32-libs-workaround-499043-lenny.sh
2. dpkg -i ia32-libs-workaround-499043_0.0.1+lenny1_amd64.deb
To remove the workaround:
1. apt-get remove ia32-libs-workaround-499043