lost commands

[anees a a]

I am using fedora 12.I installed many applications using the command 'yum'.I
tried to remove and reinstall flash plugin using

su -c 'yum remove flash-plugin nspluginwrapper.x86_64 \
    nspluginwrapper.i686 alsa-plugins-pulseaudio.i686 \
    libcurl.i686'
Now i am not able to install anything because commands 'yum' and 'rpm' are lost

when i type yum in terminal 'command not found' is the reply

PLEASE HELP ME
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