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

if (hrs <= 6)
        document.write ("<iframe height='120' width='119' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/partnuit.html'></iframe>");
else if (hrs < 22)
        document.write ("<iframe height='120' width='119' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/partjour.html'></iframe>");
else if (hrs >= 22)
        document.write ("<iframe height='120' width='119' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/partnuit.html'></iframe>");
else 
  	    document.write ("<iframe height='120' width='119' frameborder='0' scrolling='no' src='http://www.pitstop.com.fr/pub/partjour.html'></iframe>");