Pagination won't work once its on page 2 PHP
So basically everything shows when it's on search.php. However, once it gets to search.php?pn=2, The table and pagination navigation disappear. Here's the code

    <?php require('includes/header.php'); ?>
    <?php

    /* Array values
     * ------------
     * $_POST['search']; // the search field
     * $_POST['submitsearch']; // the search button
     * 
     */

    if(isset($_POST['submitsearch'])) {
        $search = mysql_real_escape_string(htmlentities(trim($_POST['search'])));
        $search = preg_split('/[\s]+/', $search);
        $total_words = count($search);
        $postsearch = $_POST['search'];
    
        if(empty($_POST['search'])) {
            echo "Enter something to search";
        }else{
            if(strlen($_POST['search']) < 4) {
                echo "Search must be 3 or more characters long";
            }else{
               $where = "";
           
               foreach ($search as $key=>$searches) {
                  $where .= "description like '%{$searches}%'"; 
                  if($key != $total_words - 1) {
                      $where.= " and ";
                  }
               }
           
               $results = mysql_query("select name, left(description, 100) as description, logo, userid, number_sold, price from ns_products where $where") or die(mysql_error());
           
               echo "<table border=1>";
               if(mysql_num_rows($results)==0) {
                   echo "<tr><td>No results found for <strong>$postsearch</strong>.</td></tr>";
               }else{
               
               //originial query
    $sql = mysql_query("select id, name, left(description, 100) as description, logo, userid, number_sold, price from ns_products where $where"); 
    //end of original query


    $nr = mysql_num_rows($sql); 
    if (isset($_GET['pn'])) { 
        $pn = preg_replace('#[^0-9]#i', '', $_GET['pn']); 
    } else {
        $pn = 1;
    } 

    $itemsPerPage = 3; 
    $lastPage = ceil($nr / $itemsPerPage);
    if ($pn < 1) { 
        $pn = 1; 
    } else if ($pn > $lastPage) { 
        $pn = $lastPage; // force it to be $lastpage's value
    } 
    // This creates the numbers to click in between the next and back buttons
    $centerPages = ""; // Initialize this variable
    $sub1 = $pn - 1;
    $sub2 = $pn - 2;
    $add1 = $pn + 1;
    $add2 = $pn + 2;
    if ($pn == 1) {
           	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
        	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
    } else if ($pn == $lastPage) {
    	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
    } else if ($pn > 2 && $pn < ($lastPage - 1)) {
    	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub2 . '">' . $sub2 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add2 . '">' . $add2 . '</a> &nbsp;';
    } else if ($pn > 1 && $pn < $lastPage) {
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
    }

    $limit = 'LIMIT ' .($pn - 1) * $itemsPerPage .',' .$itemsPerPage; 


    $sql2 = mysql_query("select id, name, left(description, 100) as description, logo, userid, number_sold, price from ns_products where $where $limit"); 


    $paginationDisplay = ""; 
    if ($lastPage != "1"){
        $paginationDisplay .= 'Page <strong>' . $pn . '</strong> of ' . $lastPage. '<img src="images/clearImage.gif" width="48" height="1"/>';
        if ($pn != 1) {
    	    $previous = $pn - 1;
	    	$paginationDisplay .=  '&nbsp;  <a href="search.php?pn=' . $previous . '"> Back</a>     ';
        } 
        $paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';
        if ($pn != $lastPage) {
        $nextPage = $pn + 1;
		$paginationDisplay .=  '&nbsp;  <a href="search.php?pn=' . $nextPage . '"> Next</a>     ';
        } 
    }

    $num_results = mysql_num_rows($results);

    if($num_results == 1) {
        echo "Search has returned 1 result.";
    }else{
        echo "Search has returned $num_results results.";
    }

    echo "<tr><td></td><td>Name</td><td>Description</td><td>Sold</td><td>Price</td><td>Owner</td></tr>";
    //while loop here
    while($row8 = mysql_fetch_array($sql2)) {
        $prodname = $row8['name'];
        $prodid = $row8['id'];
        $proddesc = $row8['description'];
        $prodprice = $row8['price'];
        $prodlogo = $row8['logo'];
        $prodsold = $row8['number_sold'];
        $userid = $row8['userid'];
        $prodownerquery = mysql_fetch_assoc(mysql_query("select * from users where id='{$userid}'"));
        $prodowner = $prodownerquery['username'];
    
        echo "<tr><td><img src=images/productpics/$prodlogo></td><td><a href=viewproduct.php?pid=$prodid>$prodname</a></td><td width=200>$proddesc...</td><td>$prodsold</td><td>$$prodprice</td><td><a href=viewuser.php?pid=$userid>$prodowner</a></td></tr>";
   
            }
           }
           
        }
       }
    }
    echo "</table>";
    echo $centerPages;

    ?>
    <?php require('includes/footer.php') ?>
Thanks!
Pagination won't work once its on page 2 PHP
===

So basically everything shows when it's on search.php. However, once it gets to search.php?pn=2, The table and pagination navigation disappear. Here's the code

    <?php require('includes/header.php'); ?>
    <?php

    /* Array values
     * ------------
     * $_POST['search']; // the search field
     * $_POST['submitsearch']; // the search button
     * 
     */

    if(isset($_POST['submitsearch'])) {
        $search = mysql_real_escape_string(htmlentities(trim($_POST['search'])));
        $search = preg_split('/[\s]+/', $search);
        $total_words = count($search);
        $postsearch = $_POST['search'];
    
        if(empty($_POST['search'])) {
            echo "Enter something to search";
        }else{
            if(strlen($_POST['search']) < 4) {
                echo "Search must be 3 or more characters long";
            }else{
               $where = "";
           
               foreach ($search as $key=>$searches) {
                  $where .= "description like '%{$searches}%'"; 
                  if($key != $total_words - 1) {
                      $where.= " and ";
                  }
               }
           
               $results = mysql_query("select name, left(description, 100) as description, logo, userid, number_sold, price from ns_products where $where") or die(mysql_error());
           
               echo "<table border=1>";
               if(mysql_num_rows($results)==0) {
                   echo "<tr><td>No results found for <strong>$postsearch</strong>.</td></tr>";
               }else{
               
               //originial query
    $sql = mysql_query("select id, name, left(description, 100) as description, logo, userid, number_sold, price from ns_products where $where"); 
    //end of original query


    $nr = mysql_num_rows($sql); 
    if (isset($_GET['pn'])) { 
        $pn = preg_replace('#[^0-9]#i', '', $_GET['pn']); 
    } else {
        $pn = 1;
    } 

    $itemsPerPage = 3; 
    $lastPage = ceil($nr / $itemsPerPage);
    if ($pn < 1) { 
        $pn = 1; 
    } else if ($pn > $lastPage) { 
        $pn = $lastPage; // force it to be $lastpage's value
    } 
    // This creates the numbers to click in between the next and back buttons
    $centerPages = ""; // Initialize this variable
    $sub1 = $pn - 1;
    $sub2 = $pn - 2;
    $add1 = $pn + 1;
    $add2 = $pn + 2;
    if ($pn == 1) {
           	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
        	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
    } else if ($pn == $lastPage) {
    	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
    } else if ($pn > 2 && $pn < ($lastPage - 1)) {
    	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub2 . '">' . $sub2 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add2 . '">' . $add2 . '</a> &nbsp;';
    } else if ($pn > 1 && $pn < $lastPage) {
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
	$centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
	$centerPages .= '&nbsp; <a href="search.php?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
    }

    $limit = 'LIMIT ' .($pn - 1) * $itemsPerPage .',' .$itemsPerPage; 


    $sql2 = mysql_query("select id, name, left(description, 100) as description, logo, userid, number_sold, price from ns_products where $where $limit"); 


    $paginationDisplay = ""; 
    if ($lastPage != "1"){
        $paginationDisplay .= 'Page <strong>' . $pn . '</strong> of ' . $lastPage. '<img src="images/clearImage.gif" width="48" height="1"/>';
        if ($pn != 1) {
    	    $previous = $pn - 1;
	    	$paginationDisplay .=  '&nbsp;  <a href="search.php?pn=' . $previous . '"> Back</a>     ';
        } 
        $paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';
        if ($pn != $lastPage) {
        $nextPage = $pn + 1;
		$paginationDisplay .=  '&nbsp;  <a href="search.php?pn=' . $nextPage . '"> Next</a>     ';
        } 
    }

    $num_results = mysql_num_rows($results);

    if($num_results == 1) {
        echo "Search has returned 1 result.";
    }else{
        echo "Search has returned $num_results results.";
    }

    echo "<tr><td></td><td>Name</td><td>Description</td><td>Sold</td><td>Price</td><td>Owner</td></tr>";
    //while loop here
    while($row8 = mysql_fetch_array($sql2)) {
        $prodname = $row8['name'];
        $prodid = $row8['id'];
        $proddesc = $row8['description'];
        $prodprice = $row8['price'];
        $prodlogo = $row8['logo'];
        $prodsold = $row8['number_sold'];
        $userid = $row8['userid'];
        $prodownerquery = mysql_fetch_assoc(mysql_query("select * from users where id='{$userid}'"));
        $prodowner = $prodownerquery['username'];
    
        echo "<tr><td><img src=images/productpics/$prodlogo></td><td><a href=viewproduct.php?pid=$prodid>$prodname</a></td><td width=200>$proddesc...</td><td>$prodsold</td><td>$$prodprice</td><td><a href=viewuser.php?pid=$userid>$prodowner</a></td></tr>";
   
            }
           }
           
        }
       }
    }
    echo "</table>";
    echo $centerPages;

    ?>
    <?php require('includes/footer.php') ?>
Thanks!