Jorge Bucaran has created a very usefull tutorial that teaches you how to upload files via Flash. The tutorial is simple and easy to follow but does require you have atleast a intermidiate coding/programming knowledge.

All the files are available to download for free and you can use them n your wn projects. I have come across this situation myself quote a few times and my script has been slightly different to Jorges im interested to see who has the better soloution at the moment i think its Jorges but wait and see

check out the full tutorial here:

Uploading in Flash