RE: Web programming...Was PHP update and directions

Not sure what you mean by tool-agnostic, but it would be nice for the

web

side presentation to look something like the invoice. 

Sorry. I wasn't sure if you were looking for help on how to do this from
a tooling point of view (ASP vs. JSP vs. CGIDEV2 vs. etc.) or from a
user interface point of view (lists, images, buttons, checkboxes, etc.)
To me the latter is "tool-agnostic" since it doesn't really matter what
tool you're using.

Two questions I'd have from a UI design point of view. Are you expecting
them to dispute lots of items? And are they disputing a specific
line-item on an invoice, or the entire invoice? 

As far as looking like the invoice, why don't you simply show them an
image of the invoice (are they available?) if they want to see it, but
otherwise show them header information and line-level information in a
subfile-like presentation.

-Walden