function show_books($cid, $host, $php_self)
{
	$q = "select * from books where category = '".$cid."'";
	$r = mysql_query($q) or die(mysql_error());
	echo '<table>';
        $tmp = 1;
	while ($book=mysql_fetch_array($r)) 
	{ 
	if ($tmp = 1) echo '<tr>';
        echo'<td bgcolor="#CCCCCC"><a href="http://'.$host.$php_self.'?book='.$book['bookid'].'">'.$book['title'].'</a></td>';
if ($tmp = 2) { echo '</tr>'; $tmp = 0; }
$tmp++;
}
	echo '</table>';
}