Yiff lister

<form action="Index.php" method="get">
Search: <input type="text" name="SearchFor" />
<input type="submit" value="Go!" />
</form>
<script language="JavaScript">
    function SectionButton(s)
    {
        var Ptr = document.getElementById("obj"+s);
        if(Ptr.style.display=="none")
        {
            Ptr.style.display="inline";
            return;
        }
        if(Ptr.style.display=="inline")
        {
            Ptr.style.display="none";
            return;
        }
    }
</script>
<?php

//gets a filenames extension
function filename_extension($filename) {//{{{
$pos = strrpos($filename, '.');
if($pos===false) {
return false;
} else {
return substr($filename, $pos+1);
}
}//}}}

// Config

// Global variables
$Section = 1;
$FileList="";

function listdirectory($me,$base)
{
$path = $me;
$from = "";
if($path!=".")
{
    $from="$me\\";
}
$dir_handle = @opendir($path) or die("Unable to open $path");
echo "<ul style='border: 8px blue solid;'>";
while ($file = readdir($dir_handle))
{
   $Section++;
   $DisplayMe=false;
   $Extension=strtolower(filename_extension($file));
   if($file=="." || $file=="..")
    $DisplayMe=false;
   if($Extension=="")
   {
    if($file != "." && $file != "..")
    {
        echo "<li style='border: 8px lime solid;'>";
        echo '<input type="Button" value="   " onClick="SectionButton(';
        $ThisSection=$Section+rand(100,16384);
        echo $ThisSection;
        echo ');">';

        echo "$file</li>";
        if($base == 1)
        {
            echo '<span style="display: none;" ';
            echo 'id=obj';
            echo $ThisSection;
            echo '>';
        }
        echo "<li>";
        listdirectory("$from$file",0);
        echo "</li>";
        if($base == 1)
        {
            echo '</span>';
        }
    }
   }
   if($Extension=="jpg" || $Extension=="gif" || $Extension=="png" || $Extension=="svg")
   {
    $DisplayMe=true;
   }
   if($Extension=="swf")
   {
    $flashes=$flashes."<a href='$from$file'>$file (Flash)</a><br>";
   }
   if($DisplayMe==true)
   {
    $FileList=$FileList.'<a href="Presenter.php?File='.$from.$file.'">';
    $FileList=$FileList."$file</a><br>";
   }
}
echo "$FileList";
echo "</ul>";
closedir($dir_handle);
}
listdirectory(".",1);
echo "<br>";
echo $flashes;
?>