在另一页的iframe中打开一页的iframe中的html页面

Page1

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <h1>page1</h1>
<iframe src="" name="iframe1" id="iframe1"></iframe>
</body>
</html>

page1 contains the iframe1 which is empty and doesnt show anything in the beginning.

Page2

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <h1>page2</h1>
<iframe src="opening.php" name="iframe2" id="iframe2"></iframe>
</body>
</html>

page2 contains the iframe2 which shows opening.php.

opening.php

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
<a href="check.php" target="iframe1">click</a>
</body>
</html>

opening.php contains a link which has href=check.php and

check.php

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
<h1>alright</h1>

</body>
</html>

i want to open check.php from opening.php which is shown in iframe2 in page2, in page1's iframe1. please help!!