สอบถามข้อมูลเกี่ยวกับการรับค่าไป update เข้าไปใน table ครับผม

<form name="form1" method="post" action="save_main.php">
  <FONT FACE="arial"><table width="400" border="0" style="width: 600px">
  <ul class="blue">
    <tbody>
      <tr>
        <td><a></t>Device</a></td>
        <td>
          <label>
		  <select name="lmName1">
			<option value="">- Select Device</option>
			<?
			$strSQL = "SELECT * FROM main status group by device ORDER BY device";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["device"];?>"><?=$objResuut["device"];?></option>
			<?
			}
			?>
		  </select>
</label>
        </td>
      </tr>
      <tr>
            <tr>
        <td>Model</td>
        <td>
	        		  <select name="lmName2">
			<option value="">- Select Model</option>
			<?
			$strSQL = "SELECT * FROM main group by model ORDER BY model ";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["model"];?>"><?=$objResuut["model"];?></option>
			<?
			}
			?>
		  </select>
        </td>
      </tr>
      
              <td>Node</td>
        <td>
          		  <select name="lmName3" onchange="selectarea(this.value)">
			<option value="">- Location Node</option>
			<?
			$strSQL = "SELECT * FROM location group by location_name ORDER BY location_name";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["location_name"];?>"><?=$objResuut["location_name"];?></option>
			<?
			}
			?>
		  </select>
        </td>
      </tr>
      </tr>
      
       <tr>
        <td><a></t>Sub Node</a></td>
        <td>
          <label>
		  <select name="lmName4">
			<option value="">- Select Sub Model</option>
			<?
			$strSQL = "SELECT * FROM location WHERE sub_location != ' ' ORDER BY sub_location ";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["sub_location"];?>"><?=$objResuut["sub_location"];?></option>
			<?
			}
			?>
		  </select>
</label>
        </td>
      </tr>
      
      
             <tr>
        <td><a></t>Status</a></td>
        <td>
          <label>
		  <select name="lmName5">
			<option value="">- Status</option>
			<?
			$strSQL = "SELECT * FROM main group by status ORDER BY status ";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["status"];?>"><?=$objResuut["status"];?></option>
			<?
			}
			?>
		  </select>
</label>
        </td>
      </tr>
      <tr>
      
      
      
      <tr>
        <td>Name</td>
        <td>
        <input name="txtName" type="text" id="txtName" value="<?=$objResult["name"];?>">
        </td>
      </tr>
      <tr>
        <td>ip</td>
        <td><input name="txtIP" type="text" id="txtName" value="<?=$objResult["ip"];?>">
        </td>
        
      </tr>

      <tr>
      
             <tr>
        <td>Serial Number</td>
        <td><input name="txtSN" type="text" id="txtName" value="<?=$objResult["serial_number"];?>">
        </td>

      </tr>
      <tr>     
            <tr>

        <td></td>
        <td><BR><BR>
        
          <input type="submit" name="Submit" value="Save">
        </td>
      </tr>
    </tbody>
  </table></FONT>
  <br>

</form>