Thank you very much. Everything works!
//Infomail (see <
http://www.dokuwiki.org/plugin:Infomail>)
if(file_exists(DOKU_PLUGIN."infomail/action.php") &&
!plugin_isdisabled("infomail")){
$_vector_tabs_left["ca-infomail"]["text"] = "Infomail";
$_vector_tabs_left["ca-infomail"]["href"] = wl(cleanID(getId()), array("do" => "infomail", 'id' => $ID ), false, "&");
# $_vector_tabs_left["ca-infomail"]["href"] = wl(cleanID(getId()), array("do" => "recent"), false, "&");
$_vector_tabs_left["ca-infomail"]["nofollow"] = true;
}