//显示所有的留言  $conn=mysql_connect("hostname","username","password");$db=mysql_select_db("dbname",$conn);$numcolumns=8;//每页显示的纪录数  $query="select*fromguestbook";$result=mysql_query($query);$allnums=mysql_num_rows($result);//计算所有的纪录数$n...