function referThisPageToFriend(){
    openModalWindow_sk('none');
    ajax.replace('index.php', 'modalWindowContentWrapper_' + numberModalWindowOpen, 'post', 'ajaxAction=client_file/themes/' + JS_SITE_THEME + '/forms/refer_a_friend.php&myURL=' + JS_SCRIPT_URI_REFER_FRIEND + '&thisWindow=modalWindowContentWrapper_' + numberModalWindowOpen);
}