PostURL parameter specifies the URL to which a file or files will be posted.

Note: If the client system is Mac+IE or Windows/Unix/Linux + Netscape 6.x (which do not support JSObject), any response generated by the processing page assigned to PostURL will not be displayed.  If you wish to display results to users with these client systems, you should use the NoJSObjectSupportPostURL parameter to post files from those systems to a different processing page. 

See also NoJSObjectSupportPostURL , Uploading from Mac or NS6.