I know how to write to a file, but I want to know if its possible to write to a certain part of the file? The code I use to write text to a file:

PHP Code:
$support="Name: " . $name . "\nMessage: " . $msg . "\nEmail: " . $email . "\nDate: " . $Date;

$fp=fopen("support.php", "a+");            
fwrite($fp, $support); 
fclose($fp); 
How would I make that write after and before some code? So the code looks like this:-

Code:
<HTML><TITLE>Support</TITLE>
<br/><br/>
Name: my name
Message: my message
Email: myemail
Date: 06 August 2007
</HTML>