Ok, let me give a little more explanation....
Currently, Site A on Host A has a link to a form that resides on my server, which is an enquiry form and is in asp. So, when they click the link to submit an enquiry, they are taken to my server. Then they fill in the form, click submit and they are taken to another form on my server. This has a browse button so they can then find their file, click submit again and their file is uploaded to my server, in my office.
I would like exactly the same functionality except that the url looks as though they are staying on the same site on Host A. i.e. I don't want them to know they are actually being taken to my server with a different url. Does that make sense? Is that possible?