<?
    #
    # some code to stop double posting
    # by cal
    #

    # grab the last post by this user
    $last_post_row = mysql_fetch_array(mysql_query("SELECT * FROM posts WHERE user_id='$user' ORDER BY post_time DESC LIMIT 1",$db));

    # compare against the message they just posted
    if (AddSlashes($last_post_row[message]) != $message){

        # it's different - put the message in the database
        $time = time();
        $result = mysql_query("INSERT INTO posts (user_id, message, post_time) VALUES ('$user', '$message', $time)",$db);
        $post_num = mysql_insert_id();

    }else{

        # it's the same message - hold onto the old message id
        $post_num = $last_post_row[id];
    }

?>