PHP的效能已经实现，却总是报错

PHP的功能已经实现，却总是报错
代码的目的是实现图片上传到指定目录，并且在mysql中记录图片路径。
现在目的已经实现，可是页面总是报错，

报错内容就是第二行：

PHP code

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<?php if ($_GET['action'] == "save"){  //这行报错：Notice: Undefined index: action in D:\xampp\htdocs\upload.php on line 2
include_once('MYDBconn.php');
include_once('UPclass.php');
$titles=$_POST['title'];
$images=$uploadfile;
if($titles == "")
echo"<Script>window.alert('No title');history.back()";
$sql="insert into product(title,pic) values('$titles','$images')";
$result=mysql_query($sql,$conn);
echo"<script>window.alert('congratunations');location.href='upload.php'</script>";
}
?>



<title>images transfer</title>


    

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