please help with this simple problem

i am coding a simple script to post a text area into a file. it works, but it posts it at the bottom and i wanted to have it post to the top of the text already there.. here's a snip of the important part of the script: $fp = fopen (basename($PHP_SELF) . ".comment", "a"); fwrite ($fp, $message); fclose ($fp); } any help would be much appreciated