คือผม insert ข้อมูลลงฐานข้อมูลไม่ได้อะครับ มัน Error ตรง FK อะครับ ผมทำการลงข้อมูลแบบหลายตารางอะครับช่วยที่

$sql3="INSERT INTO brand (bnd_id,bnd_name)";
$sql3.="VALUE ('$id','$brand')";
mysql_query($sql3);
$sql2="INSERT INTO model (mod_id,bnd_id,mod_name)";
$sql2.="VALUE ('$id','$id','$model')";
mysql_query($sql2);
$sql5="INSERT INTO type (typ_id,typ_name)";
$sql5.="VALUE ('$id','$type')";
mysql_query($sql5);
$sql7="INSERT INTO employee (emp_id,emp_name,emp_rank,emp_grade,emp_tel)";
$sql7.="VALUE ('$empid','$empname','$rank','$grade','$tel')";
mysql_query($sql7);
$sql8="INSERT INTO address (add_id,add_floor,add_building,add_side,add_section)";
$sql8.="VALUE ('$id','$floor','$building','$side','$section')";
mysql_query($sql8);
$sql9="INSERT INTO pattern (pat_id,pat_detail)";
$sql9.="VALUE ('$id','$pant')";
mysql_query($sql9);
$sql1="INSERT INTO equlpment (emp_id,set_id,try_id,srl_id,ip_address,mod_id,pat_id)";
$sql1.=" VALUE ('$empid','$id','$id','$id','$id',' ','$pant')";
mysql_query($sql1);
$sql6="INSERT INTO set (set_id,set_name,add_id,emp_id)";
$sql6.="VALUE ('$id','$comset','$id','$empid')";
mysql_query($sql6);
$sql4="INSERT INTO serial (srl_id,srl_name,timestamp,old_srl)";
$sql4.="VALUE ('$id','$comset',' ',' ')";
mysql_query($sql4);