result??

$i = 0;
/*
resul ?? bukan result?
*/

while( $row = mysql_fetch_array( $resul ) ) {
    $rsponsor[$i]=$row[username]; $i++;
}

if(count($rsponsor)!=0)
{
    $acak = array_rand($rsponsor,1) ;
}else{
    die('tidak ada data yang bisa di acak');
}
$id=$rsponsor[$acak];
$seleksi = mysql_query( "SELECT * FROM member WHERE username='$id'" ) or error( mysql_error() ); $data = mysql_fetch_array( $seleksi );