editรูปที่ upload ไปไม่ผ่านเพราะไม่ส่งค่า id ไป edit ให้เพราะเหตุอะไรครับ

<form name="webForm" method="post" action="save_edit.php?idmember=<?=$_GET["idmember"];?>" enctype="multipart/form-data">

<input type="hidden" name="idmember" value=<? echo "$idmember"; ?>>
<img src="IMG/<?=$result1["member_photo"];?>">

<input type="file" name="member_photo" id="member_photo" size="30">

 ชื่อ (ไทย): <input type="text" name="name_th" id="name_th" class="input" value="<? echo $name_th; ?>" placeholder="ชื่อ (ภาษาไทย)">

<button  type="submit" name="submit" class="btn btn-default">Submit</button>
</form>

<?
		require_once "connectdb.php";
		require_once "tdate.php";
		$strSQL = "UPDATE member ";
		$strSQL .=" SET name_th = '".$_POST["name_th"]."' WHERE idmember = '".$_GET["idmember"]."' ";
		$objQuery = mysql_query($strSQL);		
	
	if($_FILES["member_photo"]["name"] != "")
	{
		if(copy($_FILES["member_photo"]["tmp_name"],"IMG/".$_FILES["member_photo"]["name"]))
		{
			
			@unlink("IMG/".$_POST["hdnOldFile"]);
			$strSQL = "UPDATE member ";
			$strSQL .=" SET member_photo = '".$_FILES["member_photo"]["name"]."' WHERE idmember = '".$_GET["FilesID"]."' ";
			$objQuery = mysql_query($strSQL);		

			echo "Copy/Upload Complete<br>";

		}
	}
?>