รบกวนสอบถามเรื่อง การอัพโหลดรูปภาพและการแทนที่รูปภาพครับ

if(trim($_FILES["img"]["tmp_name"]) != ""){ 
		if($checkid==""){
			$images = $_FILES["img"]["tmp_name"];
			srand((double)microtime()*1000000);
			$Pic_name=$random_pic = rand(1,9999999);
			$new_images = "$Pic_name".".jpg";
			copy($_FILES["img"]["tmp_name"],"product/img-product/".$new_images);
			$width=80;
			$size=GetimageSize($images);
			$height=round($width*$size[1]/$size[0]);
			$images_orig = ImageCreateFromJPEG($images);
			$photoX = ImagesX($images_orig);
			$photoY = ImagesY($images_orig);
			$images_fin = ImageCreateTrueColor($width, $height);
			ImageCopyResampled($images_fin, $images_orig, 0, 0, 0, 0, $width+1, $height+1, $photoX, $photoY);
			ImageJPEG($images_fin,"product/img-product/".$new_images);
			ImageDestroy($images_orig);
			ImageDestroy($images_fin);
			$strSQL = "INSERT INTO product ";
			$strSQL .="(Name_product,Name_team,Size,Number,price,price_cost,img)";
			$strSQL .="VALUES ";
			$strSQL .="('".$_POST["name_product"]."'";
			$strSQL .=",'".$_POST["team"]."'";
			$strSQL .=",'".$_POST["size"]."'";
			$strSQL .=",'".$_POST["number_product"]."'";
			$strSQL .=",'".$_POST["price"]."'";
			$strSQL .=",'".$_POST["price_cost"]."'";
			$strSQL .=",'".$new_images."')";
			$objQuery = mysql_query($strSQL);
	    	echo "<script language=\"JavaScript\">";
			echo "alert('บันบึกรายการเรียบร้อยแล้ว ค่ะ');";
			echo"window.location='index.php';";
			echo "</script>";
			exit();
		}else{
			$sql1="Select * from product Where Id_product ='".$_POST["checkid"]."'";
			$rstTemp1=mysql_query($sql1);
			$rstTempre1=mysql_fetch_array($rstTemp1);
			$pic = $rstTempre1["img"];
			$delf = unlink("product/img-product/$pic");
			$images = $_FILES["img"]["tmp_name"];
			srand((double)microtime()*1000000);
			$Pic_name=$random_pic = rand(1,9999999);
			$new_images = "$Pic_name".".jpg";
			copy($_FILES["img"]["tmp_name"],"product/img-product/".$new_images);
			$width=80;
			$size=GetimageSize($images);
			$height=round($width*$size[1]/$size[0]);
			$images_orig = ImageCreateFromJPEG($images);
			$photoX = ImagesX($images_orig);
			$photoY = ImagesY($images_orig);
			$images_fin = ImageCreateTrueColor($width, $height);
			ImageCopyResampled($images_fin, $images_orig, 0, 0, 0, 0, $width+1, $height+1, $photoX, $photoY);
			ImageJPEG($images_fin,"product/img-product/".$new_images);
			ImageDestroy($images_orig);
			ImageDestroy($images_fin);
			$strSQL=" UPDATE product SET Name_product =  '".$_POST["name_product"]."',Name_team =  '".$_POST["team"]."',Size =  '".$_POST["size"]."',Number =  '".$_POST["number_product"]."',price =  '".$_POST["price"]."',price_cost =  '".$_POST["price_cost"]."',img =  '".$new_images."' WHERE Id_product = '".$checkid."' " ;
			echo "<script language=\"JavaScript\">";
			echo "alert('update รายการเรียบร้อยแล้ว ค่ะ');";
			echo"window.location='index.php';";
			echo "</script>";
			exit();
		}
	}