<?
 #
 # 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];
 }
?>