$sql="select * from doc_in where id_department='$id_department' ORDER BY number_in DESC" ;
$_SESSION["id_department"] = $result["id_department"];
$ans= mysql_query($sql);
$num = mysql_num_rows($ans);
$sql="SELECT * FROM doc_in , department , memberuser WHERE
doc_in.id_department=department.id_department and
memberuser.id_department=department.id_department
ORDER BY number_in DESC" ;
$ans= mysql_query($sql);
$num = mysql_num_rows($ans);