MySQL problem - stumped

The following code is giving an me problems, I can't figure it out to save my soul. The last line gives: Here is the code: $link = db_connect(); $query = "UPDATE Users SET firstname='$firstname', lastname='$lastname' WHERE username='$user' && password='$password'"; $result = mysql_query($query, $link); $err = mysql_error(); echo "Errors:".$err; $rows = mysql_affected_rows($result); And here is the output: Errors: Warning: Supplied argument is not a valid MySQL-Link resource in /****/*****/****/**********.********.***/db.php on line 147 Line 147, is the last line in the above snippet. I cleared out the path name for security, no offense intended :) Now, I KNOW that the db_connect() function is not the problem, as I use it in many other places in this script with no errors. What am I missing? - John Vanderbeck - Admin, GameDesign