PHP でページをめくるときに次のページに進めないのはなぜですか? 助けてください。

include("script/conn.php");    class Page{        private $page;	//当前页码        private $page_num;	//数据总共分多少页显示        private $page_size;	//每页显示的数据条数        private $sql;	//查询的SQL语句        private $limit;	//查询语句后面的limit控制语句	private $total_Num;	//总记录数        public function __construct($sql='',$page_size=3){            $result = mysql_query($sql);            $this->total_Num = mysql_num_rows($result);            $this->page_size = $page_size;            $this->page_num = ceil($this->total_Num / $page_size);	//计算总页数            $this->sql = $sql;            $temp = (isset($_GET["page"]) ? $_GET["page"] : 1);	//获取当前页数            $this->setpage($temp);            $this->showpage();            $this->showFoot();        }        private function showpage(){            $this->limit = " LIMIT ".(($this->page - 1)* $this->page_size).",".$this->page_size;	//limit语句            $result = mysql_query($this->sql.$this->limit);            if (!$result){	//判断结果是否存在                if ($this->page_num > 0){	//如果不存在且页数大于0                    echo "查询出错"."<br>";                }else{                    echo "无数据"."<br>";                }                return;            }            $cols = mysql_num_rows($result);            while($row = mysql_fetch_array($result)){				echo "<img src=".$row['Image']." />";				echo "<br/>";            }        }        private function setpage($page){                if($page < 1){                    $page = 1;                }                else if($page > $this->page_num){                    $page = $this->page_num;                }                    $this->page = $page;        }        private function showFoot(){			echo "<br/>";            echo "<a href='?page=1'>首页</a>丨";            echo "<a href='?page=".($this->page - 1)."'>上一页</a>丨";            echo "<a href='?page=".($this->page + 1)."'>下一页</a>丨";            echo "<a href='?page=".$this->page_num."'>尾页</a>丨";			echo "共有".$this->page_num."页丨";			echo "当前第".$this->page."页";        }  }

if($keyword=='桂林'||$keyword=='广西桂林'){	$result=mysql_query("select * from image_guilin limit 3");	while($abc = @mysql_fetch_array($result)){		echo "<img src=".$abc['Image']." />";		echo "<br/>";	}	$pages = new Page(8, 3);}

		<form id="search_form" method="post" action="abcdefg.php"> 		<input type="text" id="search" value="城市、景点" onFocus="this.value=''" style="color:#ccc" name="search"/>		<input type="submit" id="s_search" value="搜索" name="Submit" onClick="return check(form)"/>		</form> 

$keyword=$_POST['search'];$sql=mysql_query("select * from didian where name like '%$keyword%'");$row=@mysql_fetch_object($sql);if(!$row){	echo "<font color='red'>您搜索的信息不存在，请使用类似的关键字进行检索!</font>";}