PHP Pagination

<?php
$showPage = 20;
$pageNo = 1;
if(isset($_GET['page']) && $_GET['page']!=1) {

    $pageNo=$_GET['page'];
    $up = $showPage;
    $low=$showPage*($_GET['page']-1);

} else {

    $up = $showPage;
    $low=0;

} //endif(isset($_GET['page'])

$i=1;
$sql2=("SELECT * FROM customers ORDER BY id DESC");
$result2=mysql_query($sql2) or die (mysql_error());
$count_row=mysql_num_rows($result2);//for pagination only

$customerList = mysql_query("SELECT * FROM customers ORDER BY id DESC LIMIT $low,$up") or die(mysql_error());

while( $customerArr = mysql_fetch_array($customerList) ) { ?>
    TABLE HERE
<?php } //while( $customerArr = mysql_fetch_array($customerList) ?>

<?php if($count_row!=""){ ?>

    <div class="paging">

        <?php if ($pageNo!=1){ ?>
            <span class="prev"><a rel="prev" href="accessories.php?page=<?php echo $_GET['page']-1;?>">« Previous</a></span>
        <?php } else { ?>
            <span class="disabled">« Previous</span>
        <?php } //endif ($pageNo!=1) ?>

        <?php
        $pageCount = ceil($count_row/$showPage);
        //echo $pageCount;
        for ($i=1;$i<=$pageCount;$i++){

            if ($i == $pageNo){

                echo "<span class=\"current\">"; echo $i; echo"</span>";

            } else { ?>

                <span><a href="add_customer.php?page=<?php echo $i; ?>"><?php echo $i; ?></a></span>

            <?php } //endif ($i == $pageNo)

        } //end of for ($i=1;$i<=$pageCount;$i++) ?>

        <?php if ($pageCount!=$pageNo){ ?>
            <span class="next"><a rel="next" href="add_customer.php?page=<?php echo $pageNo+1; ?>">Next »</a></span>
        <?php } else {?>
            <span class="disabled">Next »</span>
        <?php } //if ($pageCount!=$pageNo) ?>

    </div> <!-- .paging -->

<?php } //endif($count_row!="") ?>