function open_niveau(){
var page="niveau-service.php?TB_iframe=true&height=450&width=700";
open_thickbox(page);
}
function open_mentions(){
var page="mentions-legales.php?TB_iframe=true&height=450&width=700";
open_thickbox(page);
}

function open_thickbox(page){
var t = null;
var a = page;
var g = false;
tb_show(t,a,g);
}