phpfileuploader post uploader object with jquery

phpfileuploader post uploader object with jquery

i used script of http://phpfileuploader.com/
I need post uploader object to another php file with jquery but not worked :
for example i used this code :
var uploaderobject=document.getelementbyid("myuploader");
$.post("example.php",{ sampleobject:uploaderobject},function(data)
{
alert(data); // but not worked or return empty result.
})
now how can use sampleobject in example.php and how can use of
phpfileuploader methods for example (FileName,FileSize,FileGuid,FilePath
or CopyTo,MoveTo,Delete) ?!
i used this code in example.php but not worked :
<?php
$uploader=$_POST["sampleobject"];
echo $uploader->FileName; // not worked why ?
?>