Upload problem,newbie here please help :)

[eluser]Unknown[/eluser]
still don't work. i don't know what's wrong here. CI upload form can work well with me, but why when i just copied a piece of code from there (it's just one field of input type of file, and one line of form_open_multipart), it such moving a hundred of code in here.

form_open_multipart('upload/do_upload'), my explanatory is say, make form in class upload.php, run method do_upload, so i just renamed it to form_open_multipart('hasil_rad/do_upload') which means, make form in hasil_rad class, run method do_upload there.

my question is, where the variable is going?what form_open_multipart is doing there with field contain address path?

another question if i was in functionA() and wants to call do_upload from there, is it possible?