สอบถามครับ อยากให้ loop ค่าย้อนกลับใน listbox แทนที่จะวิ่งลงไปด้านล่างให้วิ่งกลับขึ้นมาที่ตัวบนสุดแทนครับ

if($_REQUEST['action']=='frame'){
$return = "";
if ($handle = opendir("images")) {
   while (false !== ($file = readdir($handle))) {
      if ($file != "." && $file != "..") {
        if (is_dir("images/$file")) {} 
		else {
			list($filename, $fileext1, $fileext2) = explode(".", $file);
			if($fileext1 != "png"){}
			else{	
				if(strstr($filename, $site_name)){
					$images[] = $file;
				}				
			}
         }
      }
   }
   closedir($handle);
}
rsort($images, SORT_STRING);

foreach($images as $image){
$showname = substr($image,10,-4);

$return .= "<option value='$image'>".$showname."</option>";
}
echo ($return);
}

function sorter($a, $b){
	return ($a[1]<$b[1]) ? -1 : 1;
}

<script>
 var loginStatus=0;var walk=0;var currentImage;var frame;var delay=800;

$(document).ready(function(){
loadFrames();
$("#walker img").click(function(){if(walk==0){$('#walker img').attr("src","images/pause.png");walk=1;walkFrames();}else{stopWalk();}});
});

function loadImage(){$("#mainimage").attr("src","images/"+frame);}

function loadFrames(){$("#framelist").load("action.php", {'action':'frame'},function(){$('#framelist option:first-child').attr("selected", "selected");setFrame();loadImage();});}

function setFrame(){frame = $("#framelist").val();}

function walkFrames(){if(walk==1){$("#framelist option:selected + option").attr("selected", "selected");setFrame();loadImage();setTimeout('walkFrames()',delay);
	if($('#framelist option:last').val()==$('#framelist option:selected').val()){stopWalk();}}}

function stopWalk(){walk=0;$('#walker img').attr("src","images/arrow-right.png");}
</script>