Problem in paging...!

?php
$var = @$_GET['q'] ;
$trimmed = trim($var);
// database connection info
$conn = mysql_connect('localhost','asad','asad') or trigger_error("SQL", E_USER_ERROR);
$db = mysql_select_db('asad',$conn) or trigger_error("SQL", E_USER_ERROR);

// find out how many rows are in the table
$sql = "SELECT COUNT(*) FROM links";
$result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR);
$r = mysql_fetch_row($result);
$numrows = $r[0];

// number of rows to show per page
$rowsperpage = 1;
// find out total pages
$totalpages = ceil($numrows / $rowsperpage);

// get the current page or set a default
if (isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])) {
// cast var as int
$currentpage = (int) $_GET['currentpage'];
} else {
// default page num
$currentpage = 1;
} // end if

// if current page is greater than total pages...
if ($currentpage > $totalpages) {
// set current page to last page
$currentpage = $totalpages;
} // end if
// if current page is less than first page...
if ($currentpage < 1) {
// set current page to first page
$currentpage = 1;
} // end if

// the offset of the list, based on current page
$offset = ($currentpage - 1) * $rowsperpage;

// get the info from the db
$sql = "SELECT * FROM links where kw like \"%$trimmed%\"
LIMIT $offset, $rowsperpage";
$result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR);

echo "<table border=0 cellspacing=2 cellpadding=2>";

echo "<tr>";

// while there are rows to be fetched...

// echo data
    echo "<table border='0' cellpadding='5' cellspacing='5'>";



// while there are rows to be fetched...
while ($list = mysql_fetch_assoc($result)) {
// echo data

    {
echo "<tr class=style28>";
echo "<td valign=top>". $list['text'];
echo "<td valign=top><a href=\"" . $list["link"] . "\">
<img src=\"" . $list["image"] . "\" height='80' width='80' border=0 \"" . $list["text"] . "\"></a>";

//echo "<td>" . $list['kw'] . "</td>";
echo "<td valign=top>" . $list['des'] . "</td>";
echo "</tr>";
}



}

echo "</td>";
    echo "</tr>";
echo "</table>";
/****** build the pagination links ******/
// range of num links to show
$range = 3;

// if not on page 1, don't show back links
if ($currentpage > 1) {
// show << link to go back to page 1
echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=1'>First</a> ";
// get previous page num
$prevpage = $currentpage - 1;
// show < link to go back to 1 page
echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$prevpage'>Previous</a> ";
} // end if

// loop to show links to range of pages around current page
for ($x = ($currentpage - $range); $x < (($currentpage + $range) + 1); $x++) {
// if it's a valid page number...
if (($x > 0) && ($x <= $totalpages)) {
     // if we're on current page...
     if ($x == $currentpage) {
        // 'highlight' it but don't make a link
        echo " [<b>$x</b>] ";
     // if not current page...
     } else {
        // make it a link
    echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$x'>$x</a> ";
     } // end else
} // end if
} // end for
    
// if not on last page, show forward and last page links 
if ($currentpage != $totalpages) {
// get next page
$nextpage = $currentpage + 1;
    // echo forward link for next page
echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$nextpage'>Next</a> ";
// echo forward link for lastpage
echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$totalpages'>Last</a> ";
} // end if
/****** end build pagination links ******/
?>