function listfolder($input){
        $albumarray=array();
        if ($handle = opendir($input)) {
            while (false !== ($file = readdir($handle))) {
                if ($file != "." && $file != ".."  && $file != ".DS_Store" && $file != "index.html" && $file != "description.jpg") {
                    array_push($albumarray,$file);
                }
            }
            closedir($handle);
        }
        return($albumarray);
    }
    
    if (!isset($_GET['a'])){
        $albums=listfolder("photoalbums");
        reset($albums);
        while (list($key, $val) = each($albums)) {
            include("photoalbums/".$val."/description.php");
        }
    }else{
        echo("<div class=\"photoalbum\">");
        $a=clean($_GET['a']);
        if (isset($_GET['b'])){
            $b=clean($_GET['b']);
            echo("<a href=\"photoalbums/".$a."/images/".$b.".jpg\"><img alt=\"mainpic\" class=\"mainpic\" src=\"photoalbums/".$a."/images/".$b.".jpg\" width=\"498\" /></a>");
        }
        $albums=listfolder("photoalbums/".$a."/thumbnails");
        reset($albums);
        
        if (!isset($_GET['n'])){
        $num1=0;
        if (count($albums)<=12){
            $num2=count($albums);
            }else{
            $num2=12;
            }
        }else{
            $n=clean($_GET['n']);
            $num1=$n;
            if (($num1>count($albums))||($num1<0)){
                $num1=0;
                }
            $num2=$num1+12;
            if ($num2>count($albums)){
                $num2=count($albums);
                }
        }
        
        for ($i=$num1; $i<$num2;$i++) {
            $image=$albums[$i];
            $image=str_replace('-sm.jpg','',$image);
            echo("<a href=\"?p=photo&amp;a=$a&amp;b=$image&amp;n=$i\"><img alt=\"".$image."\" class=\"albumpic\" src=\"photoalbums/".$a."/thumbnails/".$image."-sm.jpg\" width=\"100\"
             /></a>");
        }
        echo("<br />");
        if (($num1>count($albums))||!($num1-3<0)){
                $num1=$num1-12;
                if (isset($_GET['b'])){
                    echo("<a href=\"?p=photo&amp;a=$a&amp;b=$b&amp;n=$num1\" class=\"previous\">Previous Page</a>");
                }else{
                    echo("<a href=\"?p=photo&amp;a=$a&amp;n=$num1\" class=\"previous\">Previous Page</a>");
                }
        }
        if ($num2<count($albums)){
                if (isset($_GET['b'])){
                    echo("<a href=\"?p=photo&amp;a=$a&amp;b=$b&amp;n=$num2\" class=\"next\">Next Page</a>");
                }else{
                    echo("<a href=\"?p=photo&amp;a=$a&amp;n=$num2\" class=\"next\">Next Page</a>");
            }
        }
        
        
        echo("</div>");
    }