Reload synaptic

hey everyone i am having a wonderful time with linux it is the best think i have ever done. there is nothing like doing and learning at the same time need some help with a problem:

W: GPG error: http://deb.mulx.net hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B1F5957DE4946268

I get this error everytime i reload synaptic any ideas

Sounds like you've added a repository without the corresponding key.

Run the apt-key command explained here.
http://www.playonlinux.com/en/download.html

Code:

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wget -q http://deb.mulx.net/pol.gpg -O- | sudo apt-key add -

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thanx u for that lightning response. It work well thanx again