[Javascript] dynamically setting the value for a file select element

[Geoff Corriere]

Hello,

I have a form that users fill out to order products. Prior to 
submitting the form to place the order, the form gets submitted in 
order to calculate pricing. PHP handles the server side programming and 
kicks back the pricing, the form, and all the data the user entered to 
the same file that originally submitted the form. Any data the user 
previously entered into form fields (such as name & address) gets 
flowed into the form. This works fine with form elements such as text 
fields and radio selects.

The problem I am having is with <input type="file"> elements. I have 
not figured out a way to dynamically set the value of the element. I 
cannot set the value of the element using PHP. And any attempts to set 
the value with JavaScript give me "Security errors" in Venkman's JS 
debugger.

Any ideas on dynamically setting the value for a file select element?

Thanks
Geoff