image upload...ajax process only works once

hi,

i am having a weird problem. on a site, a user can upload a picture.
when its uploaded the picture gets loaded in a div area as a preview.
now that works fine. but if i do this whole thing again, maybe cause i
want a different picture, the new picture is not loaded, although the
uploading process worked. i checked on my HDD.

this is what i do:

i have a form for the file uploading in my view:
<?php
echo $form->create('Link',
array('name'=>'uploadProfileImageForm','id'=>'uploadProfileImageForm','type'=>'file'));
echo $form->file('Link');
?>
<div class="submit">
<button onClick="functionCaller(this.form)" type="button">Hochladen</
button></div>
<?php
echo $form->end();
?>

now a JS function is called to acutally upload the pic, to show the
ajax loading icon, and to call the function, that acutally renders the
uploaded image in a specific div for a preview.

function functionCaller(form)
{
ajaxUpload(form,'processFlyer','flyer_css','<img src=\'../img/icons/
loader.gif\' width=\'16\' height=\'16\' border=\'0\' />','Fehler beim
Upload');
setTimeout("refreshflyer()", 500);
//refreshdiv();
}

calling a controller function to render the pic from this JS function

function refreshflyer(){

$('#flyer_preview').load('renderflyerpreview');
}

and that is the functin in my controller that gets the path to the
image and renders it in a div in my view

function renderflyerpreview()
{
$this->set('link_flyer_path_temp', ($this->Session-
>read('Link.flyer_path_temp')));
$this->render('render_flyer','ajax');
}

as i said it works fine the first time you do upload an image...the
second time...nope...the image gets uploaded, but not rendered!!??
is this some sort of caching problem?

BIG THX :)

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