[jQuery] jqUploader using action does not work with HTTP.

This form action not working:
<form enctype="multipart/form-data" action="http://localhost/argofile/
index.php/upload/do_upload" method="POST" class="a_form">

I'm using code igniter framework, this type of url is the path for the
"file" :
http://localhost/argofile/index.php/upload/do_upload

When i click the upload button, this error happens:
HTTP error: with NAMEofFILE: error #404

See this print-screen:
http://hermes.araripina.com.br/imagens/jqUploader.png

When not using the framework, php normal use. Directing the form to
the file, it works normally.

When not using the framework, php normal use. Directing the form to
the file, it works normally.

Someone can help me solve this? Well I have to use framework without
using HTTP address on the form.

I await any response,

Hermes Alves