simple flod

<!DOCTYPE HTML PUBLIC "-//W3C//DTD
HTML 4.01//EN" "http://www.w3.org/ TR/html4/strict.dtd ">
<html>
<head>
<style type="text/css">
pre{
margin-top:0px; margin-bottom:0px;
}
</style>
</head>
<body>
<form action="<? echo $_SERVER['PHP_SELF'] ; ?>" method="Post">
<input type="text"
name="ipAddress">
<input type="submit" value="Ping">
</form>
<? if(isset($_POST['ipAddress'])){
echo "<pre>";
system("(ping ".$_POST['ipAddress'].")2>&1");
echo "</pre>";
} ?>
</body>