function ajaxReq(div,params,actionPage) {
    var url = actionPage;
    var ajax = new Ajax.Updater
    (
        {success: div},
        url,{method: 'post', parameters: params}
    );
}

function openJSbox(id, params, actionPage, loadingdiv)
{
    Effect.Appear(id, { duration: 0.5 });

    $(id).update("<div class=\"tmpLoading\"><img src=\"/medias/images/loading.gif\"></div>");

    ajaxReq(id,params,actionPage);
}

function closeJSbox(id)
{
    Effect.Fade(id, { duration: 0.5 });
}