Novice simple PHP paging about problems, but don't know why not paging

Novice Simple PHP paging problem, but do not know why not paging?

PHP Code

  
  = $page _count) $page = $page _count; $select _limit = $page _size; $select _from = ($page-1) * $page _size. ', '; $pre _page = ($page = = 1)? 1: $page-1; $next _page= ($page = = $page _count)? $page _count: $page + 1; $pagenav. = "$page/$page _count page Total $rows records"; $pagenav. = "Home"; $pagenav. = "Previous page"; $pagenav. = "Next page"; $pagenav. = "Last"; $pagenav. = "Jump to\ n "; for ($i =1; $i <= $page _count; $i + +) {if ($i = = $page) $pagenav. = "$i \ n "; else $pagenav. = "$i \ n "; }} include ("conn.php"),/////////////////////////////uses the pager function to calculate the $select _from from which record to start the retrieval, $pagenav output paging navigation $rows = MySQL _num_rows (mysql_query ("SELECT * from Manager"); echo $rows;p ager ($rows, 2); $sql = "SELECT * from manager limit $select _from $select _limit"; echo $sql; $rst = mysql_query ($sql); while ($row =mysql_fetch_array ($rst)) {?>          
            
            
            
            
            
            
            
            
            
            
  

The specific pages are calculated, that is, click on the next page can not be page, very depressed

------Solution--------------------
Where are the variables to be used in the pager function $page assigned values?

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