สอบถามเรื่องการอัพโหลดรูปครับ ภาพเล็กๆ มันไม่ยอมอัพโหลดให้ครับ

<?
	$fileupload=$_FILES['fileupload']['tmp_name'];
	$fileupload_name=$_FILES['fileupload']['name'];
	$fileupload_size=$_FILES['fileupload']['size'];
	$fileupload_type=$_FILES['fileupload']['type'];
	
	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" or $lastname=="png") {
			$sql2="select max(id_product) from tb_product";
			$result2=mysql_db_query($dbname,$sql2);
			$row2=mysql_fetch_row($result2);
			
			$imagename=$row2[0].".".$lastname;
			
			if ($lastname =="jpg" or $lastname =="jpeg") {
				$image_resize = imagecreatefromjpeg($fileupload);
			} else if ($lastname =="png") {
				$image_resize = imagecreatefrompng($fileupload);
			} else if ($lastname =="gif") {
				$image_resize = imagecreatefromgif($fileupload);
			}
			$image_size=getimagesize($fileupload);
			$image_w=$image_size[0];
			$image_h=$image_size[1];
			if ($image_w>=700) {
				$new_w = 700;
				$new_h = round(($new_w/$image_w)*$image_h);
				$new_image = imagecreatetruecolor($new_w,$new_h);
				imagecopyresized($new_image, $image_resize,0,0,0,0,$new_w,$new_h,$image_w,$image_h);
				if ($lastname =="jpg" or $lastname =="jpeg") {
					imagejpeg($new_image,"product/$imagename");
				} else if ($lastname =="png") {
					imagepng($new_image,"product/$imagename");
				} else if ($lastname =="gif") {
					imagegif($new_image,"product/$imagename");
				}
				imagedestroy($image_resize);
				imagedestroy($new_image);
			}
			
			$sql3="update tb_product set image_product='$imagename' where id_product ='$row2[0]'";
			$result3=mysql_db_query($dbname,$sql3);
		}
		unlink($fileupload);
	}
	echo "<font color='ffffff'><center>เพิ่มสินค้าใหม่เข้าระบบเรียบร้อยแล้ว</center></font> <br />";
	echo "<center>[<a href=product.php><font color='ffffff'>กลับสู่หน้าเพิ่มสินค้า</font></a>]</center>";
?>