<?php
echo "<a href='http://www.yourweblog.com/yourfile.html' onclick='window.open('http://www.yourweblog.com/yourfile.html','popup','width=500,height=500,scrollbars=no,resizable=no,toolbar=no,directories=no,location=no,menubar=no,status=no,left=0,top=0';) return false'>About</a>";
?>