It seems that the problem is fixed thanks to your advices :

http://yfrog.com/ehvitre5p

apparently the fact that the glass part is a box was the cause of the problem :
the box doesn't have an IOR factor so it behaves like a normal object, not like
a reflecting one. I added the interior part in the code of the glass part :

        box
        {
        <epaisseurCarreau,epaisseurCarreau,epaisseurCarreau/2>

<largeurCarreau-epaisseurCarreau,hauteurCarreau,epaisseurCarreau/2+0.001>
        texture{Window_Glass}
        interior { ior 1.8}
        //I don't know much about the value of the Ior but it works now
        }

Thank you for your help!

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