working on phpnuke - submit topics module, need help on File upload

I had posted the following msg at phpnuke.org but nobody reply me. I not sure izzit suitable to post up here but i am urgently need for help. My post: ------------------------------------------------------------------------------------------------------------------------------ I am working on a module tat allowed visitors to submit their own company logo as a new topics and it will be approve by the admin. I facing problem now at the logo uplaod part. as i understand, every post variable will be automatically convert to variable with the same name like : <input type=\"text\" name=\"topic_text\" size=\"40\" maxlength=\"40\" > i jsut need to call $topic_text and i will get the variable of that form field. however, this do not work for <input type=\"file\" name=\"topic_image\"></input> and I already using enctype="multipart/form-data" I tried to get with $_FILES['topic_image'] but do not work.. expert here pls HELP ME~~~! p/s the module is for nuke version 6.9 regards, eXiang