??      include001.php     
<html>
<head>
<title>include001.php????????????</title>

<style>
<?php
$iro = $_POST['iro'];
if($iro == NULL){
echo "body{background-color : #ffffff;}";
}else{
echo "body{background-color : " . $iro .";}";
}
?>
</style>

</head>

<body>
<h1>include001.php????????????</h1>
<h3>include001.php?post?</h3>
<form action="include001.php" method="post">
???????????????????????<br>
<input type="text" name="iro" value="#ffffff" />
<input type="submit" value="??" />
</form>
</body>
</html>