(4051) Analog Multiplexer / DeMultiplexer library update

Dear All,

first of all, sorry if my question had been posted before, but I'm not able to search.

I have 2 IC 4051 and I wanted to build a input matrix to connect 16 switchs.

I've searched all google, but didn't get any luck.
I only found this: Arduino Playground - HomePage
but I didn't understand it.

Does any of you have a sample scheme / code for a input matrix with two IC 4051?

My main goal, is to have the 16 inputs, and get the button pressed result on serial.print.
Like: you press button number X

Thanks for your support.

Have a nice day.