UPLOAD scripts refuse to function

ok, someone please lend me some advice here. I am trying create a upload form for my site. Sure that sounds easy right? well I have tried at least 10 different php scripts as well as a handful of cgi. Same resuls with everyone of them...nothing in my specified tmp folder. After contactig my host so many times, they know my name by voice, I have made no progress and here I sit without a very neccessary aspect of our website. Anyone have any idea on this...is there something server side that would prohibit me from executing my upload scripts? (yes chmod the folder...done) I have no problem with ANY other cgi or php script that I have used. Thanks in advance for any insight... -Cory