How to upload file in cakephp without refersh page

class ProfilesController extends AppController {
var $name = 'Profiles';
public $uses = array('Profile');
function changeprofilephoto() {
$profile_id = “14”; //
$path = "../../app/webroot/profilepic/";//set path
$valid_formats = array(".jpg", ".png", ".gif", ".bmp", ".jpeg");//
if($this->data)
{
$this->Profile->set( $this->data );
$name = $this->data["Profile"]['profile_pic']['name'];
$size = $this->data["Profile"]['profile_pic']['size'];
if(strlen($name))
{
$fileExt = substr(strrchr($name, '.'), 0);
if(in_array($fileExt,$valid_formats))
{
if($size<(1024*1024))
{
$actual_image_name = strtotime(date('Y-m-d H:i:s')).$fileExt;
$tmp = $this->data["Profile"]['profile_pic']['tmp_name'];
if(move_uploaded_file($tmp, $path.$actual_image_name))
{
$this->Profile->set($this->data);
$this->Profile->id=$profile_id;
$this->Profile->saveField('uploadfoldername',$actual_image_name);
echo "<img src='/profilepic/".$actual_image_name."' class='preview'>";
$this->Session->write('suc','1');
$this->redirect($_SERVER['HTTP_REFERER']);
}
else
echo "failed";
}
else
echo "Image file size max 1 MB";
}
else
echo "Invalid file format..";
} else
echo "Please select image..!";
exit;
}
}
}

 <?php
echo $this->Html->script('jquery.min.js');
echo $this->Html->script('jquery.form.js');
?>
 
<script type="text/javascript" >
$(document).ready(function() {
$('#profile_pic').live('change', function(){
$("#preview").html('');
$("#preview").html('<img src="../img/loader.gif" alt="Uploading...."/>');//download loding image
$("#Profile").ajaxForm({
target: '#preview'
}).submit();
});
});
</script>
<style>
.preview
{
width:200px;
border:solid 1px #dedede;
padding:10px;
}
#preview
{
color:#cc0000;
font-size:12px
}
</style>
<div class="layout-popup f-left">
<?php
echo $this->Form->create('Profile',array('id'=>'Profile', 'controller'=>'Profiles','action'=>'changeprofilephoto', 'type'=>'file'));
?>
 
 
<!-- start id-form -->
<table class="frm-tbl" id="id-form" >
<tr>
<td colspan="2" class="align-t-r" >
<div class="f-left popup-title">Change profile image</div>
</td>
</tr>
<tr>
<td>Upload your image</td>
<td align="left" >
<!-- <input type="file" name="[Profile][photoimg]" id="profile_pic" /> -->
<?php echo $form->file('profile_pic', array('id'=>'profile_pic', "label" => false, "div"=>false, 'class'=>'styled-input-big'))?>
</td>
</tr>
<tr>
<td colspan="2">
<div id='preview'>
</div>
</td>
</tr>
</table>
<?php
echo $this->Form->end();
?>
</div>