var today = new Date ()
var hrs = today.getHours();

if (hrs <= 6)
        document.write ("<iframe height='62' width='470' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/pubnuit.html'></iframe>");
else if (hrs < 22)
        document.write ("<iframe height='62' width='470' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/pubjour2.html'></iframe>");
else if (hrs >= 22)
        document.write ("<iframe height='62' width='470' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/pubnuit.html'></iframe>");
else 
  	    document.write ("<iframe height='62' width='470' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/pubjour2.html'></iframe>");