function popup(url, fen_width, fen_height, nom)
{
var top_pos = (screen.height - fen_height)/2
var left_pos = (screen.width - fen_width)/2
var nouv=window.open(url,nom,"status=yes,resizable=no,scrollbars=no,width="+fen_width+",height="+fen_height+",top="+top_pos+",left="+left_pos);
}

function popupscroll(url, fen_width, fen_height, nom)
{
var top_pos = (screen.height - fen_height)/2
var left_pos = (screen.width - fen_width)/2
var nouv=window.open(url,nom,"status=yes,resizable=no,scrollbars=yes,width="+fen_width+",height="+fen_height+",top="+top_pos+",left="+left_pos);
}