file uploading. problems with ajax and jquery

hi,

i found out that its not poosible to upload files with js. so i tried
jquery. so far my uploading funtion works perfectly without ajax, but
i wanna have a loading icon during the upload, the web 2.0 feeling. i
tried to do it this way

http://elmicoxcodes.blogspot.com/2007/03/asynchronous-upload-like-ajax-1.html

in my view i have:
-----------------------------------
in the head section:
<script type="text/javascript" src="js/ajaxupload.js"></script>

then:

<form action="uploadProfileImage" method="post" name="standard_use"
id="standard_use" enctype="multipart/form-data">
<p><input type="file" name="filename" /></p>

<button onClick="ajaxUpload(this.form,'users/
uploadProfileImage','image_preview','Loading...','Error in upload');
return false;" type="button">test</button>
</form>
-----------------------------------

i put the ajaxupload.js file in webroot/js. in my "onclick" event i
try calling my function that does all the uploading and resizing.

this function is in my controller "users_controller"
-----------------------------------
function uploadProfileImage()
{

$image_path = $this->Image->upload_image_and_thumbnail($this-
>data,"",200,150,$this->Session->read('User.username'), true);

$updates = $this->User->findByUsername($this->Session-
>read('User.username'));
$updates['User']['image_path']= $updates['User']['username']."/".
$updates['User']['username'].".jpg";
$this->User->save($updates);

$this->redirect(array('controller' => 'users', 'action' =>
'editprofile'));

}
-----------------------------------
now if i select a file and hit the button, nothing happens. really
nothing..

any idea what is going wrong? i included the .js-file and i am calling
all function with its correct parameters..it seems cake wont react on
my onclick-event..

BIG THX

PS:

I N C A S E: this is the ajaxupload.js
-------------------
function $m(theVar){
return document.getElementById(theVar)
}
function remove(theVar){
var theParent = theVar.parentNode;
theParent.removeChild(theVar);
}
function addEvent(obj, evType, fn){
if(obj.addEventListener)
obj.addEventListener(evType, fn, true)
if(obj.attachEvent)
obj.attachEvent("on"+evType, fn)
}
function removeEvent(obj, type, fn){
if(obj.detachEvent){
obj.detachEvent('on'+type, fn);
}else{
obj.removeEventListener(type, fn, false);
}
}
function isWebKit(){
return RegExp(" AppleWebKit/").test(navigator.userAgent);
}
function
ajaxUpload(form,url_action,id_element,html_show_loading,html_error_http)
{
var detectWebKit = isWebKit();
form = typeof(form)=="string"?$m(form):form;
var erro="";
if(form==null || typeof(form)=="undefined"){
erro += "The form of 1st parameter does not exists.\n";
}else if(form.nodeName.toLowerCase()!="form"){
erro += "The form of 1st parameter its not a form.\n";
}
if($m(id_element)==null){
erro += "The element of 3rd parameter does not exists.\n";
}
if(erro.length>0){
alert("Error in call ajaxUpload:\n" + erro);
return;
}
var iframe = document.createElement("iframe");
iframe.setAttribute("id","ajax-temp");
iframe.setAttribute("name","ajax-temp");
iframe.setAttribute("width","0");
iframe.setAttribute("height","0");
iframe.setAttribute("border","0");
iframe.setAttribute("style","width: 0; height: 0; border: none;");
form.parentNode.appendChild(iframe);
window.frames['ajax-temp'].name="ajax-temp";
var doUpload = function(){
removeEvent($m('ajax-temp'),"load", doUpload);
var cross = "javascript: ";
cross += "window.parent.$m('"+id_element+"').innerHTML =
document.body.innerHTML; void(0);";
$m(id_element).innerHTML = html_error_http;
$m('ajax-temp').src = cross;
if(detectWebKit){
remove($m('ajax-temp'));
}else{
setTimeout(function(){ remove($m('ajax-temp'))}, 250);
}
}
addEvent($m('ajax-temp'),"load", doUpload);
form.setAttribute("target","ajax-temp");
form.setAttribute("action",url_action);
form.setAttribute("method","post");
form.setAttribute("enctype","multipart/form-data");
form.setAttribute("encoding","multipart/form-data");
if(html_show_loading.length > 0){
$m(id_element).innerHTML = html_show_loading;
}
form.submit();
}

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