สอบถามหน่อยครับ แก้ไขสินค้าแล้ว unlink ไม่ได้ ภาพเก่าไม่ยอมลบ

<?PHP
		$id_edit		= $_POST[id_edit];
		$prd_meta_key	= $_POST[prd_meta_key];
		$prd_meta_des	= $_POST[prd_meta_des];
		$prd_title		= $_POST[prd_title];
		$type_name		= $_POST[type_name];
		$prd_name		= $_POST[prd_name];
		$page_name		= $_POST[page_name];
		$prd_width		= $_POST[prd_width];
		$prd_hight		= $_POST[prd_hight];
		$prd_kk			= $_POST[prd_kk];
		$prd_price		= $_POST[prd_price];
		$prd_description= $_POST[prd_description];

		$fileupload=$_FILES['fileupload'] ['tmp_name'];
		$fileupload_name=$_FILES['fileupload'] ['name'];
		$fileupload_size=$_FILES['fileupload']['size'];
		$fileupload_type=$_FILES['fileupload']['type'];
		$company = company_;
		
		include("../connect/connect.php");

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
		if ($chkdel=="1") {
		$sql3="delete tb_prd set_photo_prd=''
		where prd_id = '$id_edit' ";
		$result3=mysql_db_query($dbname,$sql3);
		$path = "../images-prd/";
		$delfile = $path.$p_pic."";
		@unlink($delfile);
		}
		if ($fileupload) {
		$array_last=explode (".",$fileupload_name);
		$c=count ($array_last)-1;
		$lastname=strtolower($array_last[$c]);
		
		if ($lastname=="gif" or $lastname=="jpg" or
		$lastname=="jpeg") {
		              $newname = $company .time().".jpg";// time= ชื่อรูป
		copy($fileupload,"../images-prd/".$newname);
		
		$sql3= "UPDATE `tb_prd ` SET  `p_pic` =  '$newname'
		where prd_id = '$id_edit' ";
		//echo"$sql3";
		$result3 = mysql_db_query ($dbname,$sql3);
		}
		@unlink($p_pic);
		}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	$sql = "update tb_prd set
			prd_meta_key		= '$prd_meta_key',
			prd_meta_des		= '$prd_meta_des',
			type_name		= '$type_name',
			prd_name		= '$prd_name',
			page_name		= '$page_name',
			prd_width			= '$prd_width',
			prd_hight			= '$prd_hight',
			prd_kk			= '$prd_kk',
			prd_price			= '$prd_price',
			prd_description	= '$prd_description',
			prd_width			= '$prd_width'
			where prd_id	        = '$id_edit'";
			
		$result = mysql_db_query($dbname, $sql);
		if($result) {
		//echo $sql;
		echo"<script>alert('แก้ไขสินค้าเรียบร้อยแล้ว');window.location='all-product.php';</script>";
		}else{
		echo"<script>alert('ไม่สามารถแก้ไขสินค้าได้');history.back();<script>";
		}
?>