php and jquery image upload button after load - php

Question

I'm preparing the script facebook style wall post. Using Php and Jquery. But I have a problem. I wrote a function to upload photos. Upload a picture from your computer picture is selected when the button is clicked. and passage of the picture preview image (image loading) part opens. Photos button after installing upload pictures come back again.
The problem is that (loading image) warning does not disappear. Also (loading image) warning not lost are not coming back button to upload pictures.
Thanks in advance for your help.
jQuery
$('#photoimg').die('click').live('change', function()
{
var values=$("#uploadvalues").val();
$("#previeww").html('<img src="wall_icons/loader.gif"/>');
$("#imageform").ajaxForm({target: '#preview',
beforeSubmit:function(){
$("#imageloadstatus").show();
$("#imageloadbutton").hide();
},
success:function(){
$("#imageloadstatus").hide();
$("#imageloadbutton").show();
},
error:function(){
$("#imageloadstatus").hide();
$("#imageloadbutton").show();
} }).submit();
var X=$('.preview').attr('id');
var Z= X+','+values;
if(Z!='undefined,')
{
$("#uploadvalues").val(Z);
}
});
HTML
<div class="tb-content">
<div class="ct-tab1">
<textarea name="update" id="update" placeholder="Ne düşünüyorsun?" class="contenttextarea" ></textarea>
<div id="button_hide">
<div class="secretdiv">
<div id="webcam_container" class='border'>
<div id="webcam" >
</div>
<div id="webcam_preview">
</div>
<div id='webcam_status'></div>
<div id='webcam_takesnap'>
<input type="button" value=" Resimçek " onclick="return takeSnap();" class="camclick resimcekbutton"/>
<input type="hidden" id="webcam_count" />
</div>
</div>
<div id="imageupload" class="border">
<form id="imageform" method="post" enctype="multipart/form-data" action='message_image_ajax.php'>
<div id='preview'>
</div>
<div id='imageloadstatus'>
<img src='<?php echo $base_url;?>wall_icons/ajaxloader.gif'/> Resim yükleniyor lütfen bekleyin....
</div>
<div id='imageloadbutton'>
<input type="file" name="photoimg" id="photoimg" class="dosyasec" />
</div>
<input type='hidden' id='uploadvalues' />
</form>
</div>
</div>
<div class="videovecamerabutonlari">
<div class="imgbutonu"><img src="wall_icons/videobutonu.png" border="0" /></div>
<div class="videobutonu"><img src="wall_icons/camerabutton.png" border="0" /></div>
</div>
<div class="shr">
<input type="submit" id="update_button" class="update_button" value="Paylaş" />
<input type="submit" id="cancel" value="İptal" />
</div>
</div>
</div>
<div id='flashmessage'>
<div id="flash" align="left" ></div>
</div>
Php
<?php
function getExtension($str)
{
$i = strrpos($str,".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}
$valid_formats = array("jpg", "png", "gif", "bmp","jpeg","PNG","JPG","JPEG","GIF","BMP");
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST")
{
$name = $_FILES['photoimg']['name'];
$size = $_FILES['photoimg']['size'];
if(strlen($name))
{
$ext = getExtension($name);
if(in_array($ext,$valid_formats))
{
if($size<(10024*10024))
{
$actual_image_name = time().$uid.".".$ext;
$tmp = $_FILES['photoimg']['tmp_name'];
if(move_uploaded_file($tmp, $path.$actual_image_name))
{
$data=$Wall->Image_Upload($uid,$actual_image_name);
$newdata=$Wall->Get_Upload_Image($uid,$actual_image_name);
if($newdata)
{
echo '<img src="'.$path.$actual_image_name.'" class="preview" id="'.$newdata['id'].'"/>';
}
}
else
{
echo "Fail upload folder with read access.";
}
}
else
echo "Image file size max 1 MB";
}
else
echo "Invalid file format.";
}
else
echo "Please select image..!";
exit;
}
?>