thanks virgil...

but i feel little embarrased about this and i should add this one on this question forums that the smoke alarm are interconneted so that what i am entangled with it and yes you have very good point with it and thanks for tip and i will wait for other to replies to see what we can come up with a very good way

thanks again

merci marc [Linked Image]

Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)