function edit_user() {
		  	// Updates a user's information in the database
			$sql = "UPDATE `users` SET ";
			foreach ($this->info as $key => $value){
				 $sql.="`$key`='$value',";
			}
			$sql = rtrim($sql, ",");
			$sql.=" WHERE `user_id`='$this->user_id';";
			if ($res = mysql_query($sql)) {
				$edit_user = true;
			} else {
				$edit_user = false;
				$this->sql = $sql;
			}
			return $edit_user;
		  }