ต้องการค้นหาข้อมูลโดยการพิมพ์ชื่อหรือรหัสแต่ค้นหาไม่ได้ค่ะตอนนี้ช่วยทีค่ะต้องการด่วน

<fieldset>
<legend>ค้นหา</legend>
<table width="641" border="0">
  <tr>
    <td width="840"><form id="form_number" name="form_number" method="post" action="index.php">
      <div align="left">
        <table width="635" border="0">
          <tr>
            <td><div align="center"></div></td>
          </tr>
          <tr>
            <td><div align="center">
              <input type="text" name="keyword" value="<? echo"$keyword"; ?>" />
              ค้นหาจาก
              <select name="fields">
                <option value="<? echo "$fields"; ?>">
                  <? if ($fields=="id_number"){
				  echo "รหัสอาจารย์/นักศึกษา";
				  }elseif ($fields=="fname"){
				  echo "ชื่อ - สกุล";
				  }elseif ($fields=="name_class"){
				  echo "หมู่เรียน";
				  }elseif ($fields=="class_room"){
				  echo "โปรแกรมวิชา";
				  } ?>
                  </option>
                <option value="id_number">รหัสอาจารย์/นักศึกษา</option>
                <option value="fname" selected="selected">ชื่อ - สกุล</option>
                <option value="class">หมู่เรียน</option>
                <option value="class_room">โปรแกรมวิชา</option>
              </select>
                  <div align="center"></div></td>
          </tr>
          <tr>
            <td><div align="center">
              <input type="submit" name="Submit" value="ค้นหา" />
            </div></td>
          </tr>
        </table>
      </div>
      <div align="center"></div>
    </form>
        <div align="left">
      <?
if($fields==""){
}else{
include("../include/conf.php") ;
if($fields=="class"){
$sql2="SELECT * FROM tb_class where name_class=$fields"; 
$db_query2=mysql_db_query($db,$sql2);
$result2 = mysql_fetch_array($db_query2);
$keyword = $result2[id_class];
}
if($fields=="class_room"){
$sql3="SELECT * FROM tb_class_room where name_room=$fields"; 
$db_query3=mysql_db_query($db,$sql3);
$result3 = mysql_fetch_array($db_query3);
$keyword = $result3[id_room];
}
$sql="SELECT * FROM tb_meber where $fields=$fields"; 
$db_query=mysql_db_query($db,$sql);
$num_rows=mysql_num_rows($db_query); /* นับ Reccord ที่พบ */
$a=0;
while($a < $num_rows)
{
$result = mysql_fetch_array($db_query);
$id_number = $result[id_number];
$fname = $result[fname];
$class = $result['class'];
$class_room = $result[class_room];
$img_pro = $result[img_pro];
$status_log = $result[status_log];
if($status_log=="1"){
if ($a % 2 == 0){
?>
      <table width="609" border="0">
        <tr>
          <td><?
include("../include/conf.php");
$sql="select * from tb_meber where id_number like '%$keyword%'";
$db_query=mysql_db_query($db,$sql);
$result = mysql_fetch_array($db_query);
$id_number = $result[id_number];
$paw = $result[paw];
$fname = $result[fname];
$birth = $result[birth];
$old = $result[old];
$class_room = $result['class_room'];
$name_class = $result['name_class'];
$teach = $result[teach];
$address = $result[address];
$phon = $result[phon];
$email = $result[email];
$img_pro = $result[img_pro];
$status = $result[status];
?>
              
                <form id="form2" name="form1" method="post" action="edit_meber.php?id=<? echo"$id_number";?>">
                <table width="588" height="255" border="0" align="left">
                  <tr>
                    <td width="169" height="10"><div align="left">รหัสอาจารย์/นักศึกษา</div></td>
                    <td width="321"><div align="left"><? echo"$id_number";?></div></td>
                  </tr>

                  <tr>
                    <td><div align="left">ชื่อ - นามสกุล</div></td>
                    <td><div align="left"><? echo"$fname";?></div></td>
                  </tr>
                  <tr>
                    <td><div align="left">ที่อยู่</div></td>
                    <td><div align="left"><? echo"$address";?></div></td>
                  </tr>
                  <tr>
                    <td><div align="left">วัน/เดือน/ปี เกิด</div></td>
                    <td><div align="left"><? echo"$birth";?></div></td>
                  </tr>
                  <tr>
                    <td><div align="left">โปรแกรมวิชา</div></td>
                    <td><? 
			  	$sql3="SELECT * FROM tb_class_room where id_room=$class_room"; 
				$db_query3=mysql_db_query($db,$sql3);
				$result3 = mysql_fetch_array($db_query3);
				$keyword = $result3[name_room];
			  echo"$keyword";
			  ?></td>
                  </tr>
                  <tr>
                    <td>หมู่เรียน</td>
                    <td><? echo"$name_class";?></td>
                  </tr>
                  <tr>
                    <td>อาจารย์ที่ปรึกษา</td>
                    <td><? echo"$teach";?></td>
                  </tr>
                  <tr>
                    <td><div align="left">เพศ</div></td>
                    <td><div align="left">
                        <p>
                          <label>
                            <? 
					if($old=="1"){
					echo"ชาย";
					}elseif($old=="2"){
					echo"หญิง";
					}
					?>
                            </label>
                          <br />
                        </p>
                    </div></td>
                  </tr>
                  <tr>
                    <td><div align="left">E-mail</div></td>
                    <td><div align="left"><? echo"$email";?></div></td>
                  </tr>
                  <tr>
                    <td><div align="left">เบอร์โทรศัพท์</div></td>
                    <td><div align="left"><? echo"$phon";?></div></td>
                  </tr>
                  <tr>
                    <td valign="top"><div align="left">รูป</div></td>
                    <td><div align="left"> <img src='../images_pro/<? echo "$img_pro";?>' alt="" width='129' height='150' border="0" /></div></td>
                  </tr>
                  <tr>
                    <td><div align="left"></div></td>
                    <td><div align="left"></div></td>
                  </tr>
                </table>
                </form>
              </td>
        </tr>
      </table>
      <?
}
else {
?>
      <?
	}
}
$a++;
}
}
?></td>
  </tr>
</table>

</fieldset>