If you want to use the ID number, you have to use this code before your link to convert the username to its id number:
PHP Code:
$query = "SELECT * FROM users WHERE username = '".$username."'";
$result = mysql_query($query);
$num = mysql_numrows($result);
//Loop out code
$i=0;
while ($i < 1) {
$id=@mysql_result($result,$i,"uid");
$i++;
}
Brandon