function pop(nUrl,nNom,w,h,nScroll){

  var winl = (screen.width) ? (screen.width-w)/2 : 10;
  var wint = (screen.height) ? (screen.height-h)/2 : 10;
  var options = 'width='+w+',height='+h+',top='+wint+',left='+winl+',scrollbars='+nScroll+',resizable=yes';
  hip=window.open(nUrl,nNom,options);
  if(hip.window.focus){hip.window.focus();}
}