form search and page มีปัญหาเรือง กด next page และค้นหา ไม่ตรงกัน รบถวนถามหน่อยคับ

function epaper_search_page_form($form,&$form_state){  // search database

        $module_path = drupal_get_path('module', 'epaper');
        drupal_add_css($module_path . '/css/epaper_form.css');
        
        $form = array();
                      
        $options_t = array(0 =>' - Select - ');
	    $result = db_select('tb_type', 't')->fields('t')->execute();
		while ($row = $result->fetchAssoc()){
			$options_t[$row['id']] = $row['type'];   
		}
        
        $options_c = array(0 =>' - Select - ');
	    $result = db_select('tb_category', 'c')->fields('c')->execute();
		while ($row = $result->fetchAssoc()){
			$options_c[$row['id']] = $row['cate'];  
		}
  
        $optionsm = array(0 => 'Select', 
					'01' => 'Jan',
					'02' => 'Feb',
					'03' => 'Mar',
					'04' => 'Apr',
					'05' => 'May',
					'06' => 'Jun',
					'07' => 'Jul',
					'08' => 'Aug',
					'09' => 'Sep',
					'10' => 'Oct',
					'11' => 'Nov',
					'12' => 'Dec',
					);
               
        $form['type'] = array(
              '#type' => 'select',
		      '#title' => 'Type',
              '#options' => $options_t,              
        );
    
        $form['cate'] = array(
              '#type' => 'select',
		      '#title' => 'Category',
	          '#options' => $options_c, 
        );
        
        $y_current = date('Y')+543;
        $parenty = array_combine(range($y_current, 2500),range($y_current, 2500));        
        $optionsy = array(0 => t('Select'));
        $optionsy += $parenty;
        $form['yea1'] = array(
		      '#type' => 'select',
		      '#title' => 'Year',
              '#options' => $optionsy,
              '#suffix' => '<div class="clear"></div>', 
		);
        
        $form['subj'] = array(
              '#type' => 'textfield',
              '#title' => 'Keyword',
              '#size' => 40,
              '#default_value' => '',
        );
              
        $form['buttons']['submit'] = array(
              '#type' => 'submit',
              '#value' => t('Search'),
        ); 
       
        $search_type = isset($form_state['values']['type']) ? $form_state['values']['type'] : 0;
        $search_cate = isset($form_state['values']['cate']) ? $form_state['values']['cate'] : 0;
        $search_yea1 = isset($form_state['values']['yea1']) ? $form_state['values']['yea1'] : 0;
        $search_string = isset($form_state['values']['subj']) ? $form_state['values']['subj'] : '';
        
        $header = array(
            'id' => array('data' => t('ID', array(), array('context' => 'id')), 'field' => 'p.id'),
            'type' => array('data' => t('Type', array(), array('context' => 'type')), 'field' => 'p.type'),
            'category' => array('data' => t('Category', array(), array('context' => 'Category')), 'field' => 'p.cate'),
            'signingdate' => array('data' => t('SigningDate', array(), array('context' => 'SigningDate'))),
            'departmentno' => array('data' => t('DepartmentNo', array(), array('context' => 'DepartmentNo')), 'field' => 'p.bookat'),
            'subject' => array('data' => t('Subject', array(), array('context' => 'Subject')), 'field' => 'p.subj'));
        
        $query = db_select('tb_paper', 'p');
        $query->leftJoin('tb_type','t','p.type = t.id');
        $query->leftJoin('tb_category','c','p.cate = c.id');        
        
        if ($search_type > 0) {
		$query->condition('p.id', $id);
		$header['category']['sort'] = 'asc';
        }
        if($search_type > 0) {
            $query->condition('p.type', $search_type, 'LIKE');
        }
        if($search_cate > 0) {
            $query->condition('p.cate', $search_cate, 'LIKE');
        }
        if($search_yea1 > 0) {
            $query->condition('p.yea1', $search_yea1, 'LIKE');
        }        
        if(strlen($search_string) > 0) {
            $query->condition('p.subj', '%' . $search_string . '%', 'LIKE');
       }
        
        $count_query = clone $query;
        $count_query->addExpression('COUNT(p.id)');
        $found = $count_query->execute()->fetchField();
        //print_r($found);   
        $query = $query->extend('PagerDefault')->extend('TableSort');
        $query->limit(3)->orderByHeader($header) ;
        $query->setCountQuery($count_query);     
        $query->fields('p', array('id', 'type', 'cate', 'date1', 'mon1', 'yea1', 'bookat', 'subj', 'rem', 'file'));
               
        $result = $query->execute();        
          
    $options = array();
    foreach ($result as $record) {
        $options[$record->id] = array(
            'id' => $record->id,
            'type' => $options_t[$record->type],
            'category' => $options_c[$record->cate],
            'signingdate' => $record->date1 . ' ' . $optionsm[$record->mon1]. ' ' . $record->yea1,
            'departmentno' => $record->bookat,
            
            $fid = $record->file,
            $file = file_load($fid),
            $uri = $file->uri,
            $url = file_create_url($uri),
            'subject' => l($record->subj, $url,array('attributes'=>array('target'=>'_blank'))),
            );       
    }
    
    $def = isset($found) ? $found : '0';
      $def = $def .' '. 'rows';
      $form['found'] = array(
        '#type' => 'item',
        '#title' => t('Total : '),
        '#markup' => $def,
      );
    
    $form['table'] = array(
        '#type' => 'tableselect',
        '#header' => $header,
        '#options' => $options,
        '#empty' => t('No item available.'),
        );
        
    //print_r($found);    
    $form['pager'] = array('#markup' => theme('pager')); 
    $form['#theme'] = 'status_summary_theme';
           
    return $form; 

}