Something

<?
	$pageid = (int) $_GET['pageid'];
	if($pageid>20 || $pageid<1)
	$pageid=1;
	$per_page = 9;
	$start = ($pageid-1) * $per_page;
	$total_num = "30";
?>
<table align=center>
<tr><td  valign=top>
<table align=center cellpadding=0 cellspacing=15 background=images/gbg.gif>
<tr>
<td colspan=3 valign=top align=center>
<form>
<?php 
echo"
<select id=galid onChange=\"go()\" class=input style=\"width: 150px;background-color: orange;text-align: right;\">
		<option value=null name=null"; if($_GET['galid'] == "null") { echo"selected=selected"; } echo">&#1489;&#1495;&#1512; &#1511;&#1496;&#1490;&#1493;&#1512;&#1497;&#1492;</option>";
$result = mysql_query("SELECT * FROM `gallery` ORDER BY `id` ASC");
for ($i=1; $row=mysql_fetch_array($result); $i++) {
$name=$row['name'];
$galid=$row['galid'];
echo"
		<option value=\"$galid\" name=\"$galid\""; if($_GET['galid'] == "$galid") { echo"selected=selected"; } echo">&nbsp;&nbsp;".$name."&nbsp;&middot;</option>";}
echo"
</select>
</form>
</td>
</tr>
<tr>";

if($_GET['galid'] != "null") {
$i=0;
foreach (glob("gallery/$galid/*.{jpg,png,gif}", GLOB_BRACE) as $filename) {
if($i % 3== 0) {echo "<tr>";}
echo"
<td class=border>
<x><img src=\"$filename\" onclick=\"changeImage('$filename')\" width=75 height=75 style=\"cursor: pointer;\"></x>
</td>";
if ($i % 3 == 2) { echo"</tr>";}
$i++;
			}
	}
echo"
</table>
</td><td valign=top>
<img name=mainimage src=".$filename." class=border height=445 width=400 valign=middle>
</td></tr>
<tr>
<td colspan=2>";
$num_pages = ceil($total_num / $per_page);
				for ($i = 1; $i <= $num_pages; $i++) 
				{ 
				if($pageid-$i == 0) {$mark="";} else {$mark="-";}
				if($i != $num_pages) { $mark="-"; } else { $mark=""; } 
      				if ($pageid == $i) { echo"<td dir=ltr class=regular>$i&nbsp$mark</td>";} 
				elseif($pageid != $i) 
					{
					echo "
						<td dir=rtl>
						".$mark."&nbsp<a href=\"index.php?page=gallery&galid=$galid&pageid=".$i."\" class=regular>".$i."</a>
						</td>"; 
					}
				}
?>