Insert Text file based on URL Parameter

Question

Hello! I have been able to get data to load using PHP into my
document. BUT - that is only data that is IN the URL. So, for
example, the URL might be ...index.php?profile=123456789
In that case I can make the customer ID appear in all the
other URLs on the page.
i.e. : <a href="page2.php?profile=<?php echo
("$profile"); ?>">Click Here</a>
Today, I would like a section of code (probably in a text
file) to load in the page based on a parameter in the URL.
Something like a URL ...index.php?destination=Australia
And then in the body would something like "load australia.txt
file here".
I know this is probably bigger than I am making it sound. But
I don't know how to load a chunk of code inside another chunk of
code.
Any starting points would be much appreciated. Are there any
built-in Dreamweaver CS3 features that do this?
Jon

Answer 1

The purpose is to enter an earnest money dollar amount (Real Estate Short Sale contracts), and based on the amount, a corresponding file with a copy of a check with the proper amount will be inserted into the file at page 16.  A button would be fine , but it needs to be on the earnest money deposit line (the look of the form may not be altered).  The earnest money amounts are $1,500, $2,000, $2,500, $3,000, $3,500, $4,000, $4,500 and $5,000.